Pros: Can install 4 NVMe drives in one PCIe slot. When installed properly, all drives do show up in the BOIS. I am running this in an X399 mobo and I now have 5 (just ordered 2 more) NVMe drives. Despite what ASRock says, this can be used in RAID, (See Other Comments).

Cons: Not mentioned in the 1 page "manual" you must set your PCIe slot to Bifurcation, separating the channels. On my first attempt, with an older BIOS, I could only change PCIe slot #4 from X16 to X4/X4/X4/X4. To do this, you have to dig deep into the dark depths of the BIOS. After a small error on my part, the adapter only showed one drive and not two. I did a BIOS update and the system then let me adjust all PCIe slots to Bifurcation. After moving the card to the proper slot, all was working correctly. May or may not be a CON, but (for best/proper operation, requires 6 pin "GPU" power plug. The manual states only required when using more than 2 drives or if using Optane drives. I connected it just to be on the safe side, and I plan on installing 2 more drives.

Overall Review: As mentioned, the manufacturer says the adapter doesn't support RAID. For that, they are correct. HOWEVER, using Windows management, you can RAID 0 or RAID 1 the drives. The primary reason I purchased this was to install more than the 3 NVMe drives that the mobo can hold, and to run them in dual RAID 1's. (My first level of back-up) Other people have commented about the fan noise, I flipped the switch to were it uses 50% power and I don't hear it over my other fans, (2060RDX, twin 120's in AIO cooler top exhaust, two 120' on the front running about 1/3 speed and a 120 rear exhaust at 66% speed. When the side panel goes back on, 2 more 120's at 1/3 power for intake. Since everything appears to be running correctly, I haven't even looked at the included disk. Since it works how I want it to, I don't plan on installing the utility that is on the disk. Drives must be NVMe type and not SATA type. Other than 1 large HDD for second level back-up, I plan on using nothing but NVMe drives in my system.

Pros: Holds 4 28 inch monitors. Very stable and solidly built. Very nice left and right adjustment.

Cons: You have to completely assemble with monitors and then turn it around. Can't do any assembly from behind if your desk is against a wall. You cannot adjust vertical tilt. I recommend staying away from this stand.

Overall Review: The top bar feels it is angled upward and the bottom bar feels angled downward. Swap the two bars and still get the same effect.

Pros: 22TB Working good in my DAS

Cons: Is a refurb

Overall Review: I have found that refurbished items are usually better than new. A fault was found, it was repaired and usually made better than new. I needed a 20TB, but none were available so went with 22TB

Pros: 20TB Works good in my DAS

Cons: Not really a CON, is a refurbish

Overall Review: I have found that refurbished items are usually better than new. A fault was found, it was repaired and usually made better than new.

Pros: Does work to make SAS drive connect with SATA connector

Cons: Double checked the cable connection and it broke

Overall Review: Use baby hands when installing and never touch after it is working.

Pros: Yes it connects to a SAS drive

Cons: Does not work.

Overall Review: Don't waste your money