Pros: All 4 worked fresh from the bubble-wrap..

Cons: None so far

Overall Review: All 4 have between 20,000 - 30,000 power-on hours. Sounds like a lot, but the power-cycle counts are < 50. Translation: enterprise-installed drives from a large data center.. For comparison, I have a good dozen Hitachi 500GB drives with < 20 power-on cycles and 70,000 + hours (yes, 7+ years continuous power-on) also running fine on various systems in several locations. Truth is, if it came from a well-cared-for data-center environment, and it lights up fine, it might just outlast a new retail-grade drive. YMMV -- I had a new 3TB drive fall over completely in less than 6 months. Two caveats: I do run RAID mirrored pairs and hotspares-- everything dies eventually. And second, as enterprise drives, these run very warm. I would not run mine in a non-fan-cooled sata-to-usb enclosure, or an HTPC with a quiet (aka wimpy) fan, or anywhere without decent airflow. And if not RAIDed, I'd be very diligent about backups. But then not having backups is asking for trouble anyway.

Pros: Very fast when in operation. Good coverage. Plenty of features. Shipped with the latest firmware. Decent price for the features.

Cons: Occasionally has VERY substantial slowdowns in LAN to WAN routing, even seen by wired devices on the LAN, which need a reboot to clear. Also has had very significant WiFi slowdowns which seem to happen at the same time. I may have to start a scheduled reboot to see if that improves the situation. User interface is so-so, missing some options I'd like to have seen. Also, NO WPA-3 in this model, a painful shortfall.

Overall Review: Okay for typical internet users, but I would NOT recommend this for remote workers such as myself if rock-solid reliability is needed. I purchased in part on price, since real professional grade equipment is much more expensive. If a nightly reboot gets rid of the periodic slowdowns, I can live with it for a while. Really wish it had WPA-3 as well. UPDATE 2 months later: Nightly reboots (easy to set up within the router itself) seem to have eliminated any slowdowns. Not at all an optimal solution, but a work-around. Fortunalely for me, any torrents I might do would be on a hard-wired network, or I'd be more upset. If Wavlink ever reads these things -- It would be a huge improvement if I could schedule a WEEKLY reboot instead, but it's nightly or manual.

Pros: Solid performer on Ubuntu and Windows.

Cons: No cons so far

Overall Review: Solid performer on Ubuntu and Windows. Bluetooth on Linux is sometimes annoying, but I think that's not the trackball, it's how Bluetooth times out occasionally if I'm only using the keyboard for long periods. But the power switch on the trackball enables me to turn it off and back on, and it reconnects fine.

Pros: I've had several USB3 hubs that disconnect when transferring large amounts of data between disks. Pleased to say this one does not, which is my major need.

Overall Review: The USB sockets are very tough to insert connectors into. Once it, they are perfectly secure. Almost like the case holes are slightly small. This is not a problem for me, since I needed multiple, always-connected USB3 that operated well, but it would probably be annoying if there was a need to constantly connect/disconnect/connect. Otherwise, I'd have given 5 stars rather than 4.

Pros: Plenty of room for a 17+" laptop using a mouse alongside. Sturdy and stable. Comfortable lap cushioning. Great for bigger laptops and people who prefer a real mouse to a touch-pad.

Cons: Not a real con, but understand that this product is hefty. Which actually aids in its stability as a user moves. Spouse went from using a 15" laptop on a lightweight plastic lap desk to a 17+" power-user laptop on this, with a separate mouse, and immediately commented on the weight. But spouse is now used to it, and very happy with it overall.

Overall Review: Well made product that does perfectly what it is intended for.

Pros: The design is nice, except for the UI. It's been re-done for this model, and it's not an improvement Several options are hidden, and the manual is not a lot of help. If I hadn't been running Prussas before, I'd have been a lot more confused. I knew what I needed, but where the pixies hid the options was confusing. For example, "Preheat" should be an obvious option, but it's hidden several menus down -- and I'm not the only one to notice this. Ultimately, the UI doesn't completely suck, but be prepared to spend a few minutes getting used to it because some things are not readily apparent and their placement is not logical. Fortunately, the printer took to Octoprint well, so I don't have to deal with the LCD UI any more. If you do a lot of 3D, I can't recommend Octoprint too often -- it fixes a lot of annoying UI issues on a lot of printers.

Cons: First, the build QA on my printer was ***UNacceptable*** in one way -- there was a loose wire (!!!) from the power supply to the main board in the base. This is done at the factory, not by the user. Problem: When I first assembled and did a test print, things went okay (subject to bed leveling and z offset like any new 3D printer). Then I moved the printer to it's permanent home, and it wouldn't start up. Power supply fans started but that was it. And no, I didn't drop anything or bump stuff. I re-checked the user-assembled connections on the outside of the system, and in so doing moved the printer around a bit for convenience. Lo and behold, it started working again. Hunh! Must have been a loose push-on connector. WRONG! It failed again a day later -- no LCD startup, no LED lamp, no filament-out led, only the P/S fans.. Then started working again. Two days later, it stopped mid-print. Same symptoms. Okay, I'm guessing my printer was one of the last units assembled that week or month, and the quotas had to be met, Not unusual in items assembled in certain foreign countries. Let's open it up and see. As an EE, there's really nothing in it to scare me, though I imagine some consumers would be much more worried. Unplug the unit, opened the base -- which was easy enough to do, it seems to be made to be serviced unlike some other pieces of equipment I've had to troubleshoot in the past. I didn't even have to remove the entire upper section -- only two of four screws holding the uprights have to come off. So serious kudos to the designer for easy repair access and modular design. As I said in the title, I mostly like the design except for the UI. Gently tug on wires, since a loose connection is a likely cause of intermittent problems after movement. AHA!!! There's a wire pushed into a terminal strip that is loose and alongside the compression screw, rather than being under it and locked into place. Loosen screw, put wire where it belongs and tighten back up. Look for more loose wires, no additional ones found. Reassemble easily, starts up immediately, runs fine. Now I need to stress-test for a week or two to see if the problem is fixed for good. But having to troubleshoot within the first week a brand-new unit, and repair what the factory should have done to begin with is a serious down-check.

Overall Review: If the unit had worked consistently from the beginning, I'd have given it 4-5 stars. Good design, good price. But for the buyer to have to actually repair a brand-new unit costs Creality 2 eggs easily. First thing from Newegg that I've purchased in a long time -- among a LOT of purchases -- that had a negative experience with. I'll update if the unit continues to have problems, hoping it won't. UPDATE 1 MONTH LATER: To be fair it has been working flawlessly since I corrected the factory mistake. I've been running it a lot, deliberately, to see if more issues emerge. No more problems, and I'm liking it more and more. Based on some research, I'm led to believe that the first thing one should do with new Creality printers is to give them a good QC check and tighten the things the factory left loose or poorly adjusted. So I'll stand by me initial assessment: Good design, a little sloppy in finishing it. Knowing that, I would buy it again, but I'm not afraid to fix minor issues. Update 2 months of ownership: Okay, I'm really liking this now since it continues to work flawlessly and perform beautifully. Had the factory problem mentioned earlier not existed, I'd have called this a 5-star performer. My son and I both love it, and I was within inches of buying a second E3 S1 Pro, except that I got a "steal of a deal" on a used Anycubic Vyper from a man who was moving and wanted to downsize his equipment. That I've gone from being very disappointed in the messy factory assembly mistake to a fan willing to buy a second is a testament to the overall design and functionality.