Pros: It works

Cons: - One of the DIMMs was DOA. I'm currently in the process of a RMA with Crucial (which usually shouldn't be a problem). - On initial install, both of my systems that I am using this for refused to POST at the spec'd DDR4-3200 speeds with all four DIMMs installed in the four DIMM slots on my motherboards. As a result, I had to install either just one or two DIMMs (per the motherboard manual), to get the system to POST, so that I can go into the BIOS, and manually slow down the memory clock speed, install the other two DIMMs, and then progressively step up to the advertised memory clock speeds to get the systems to POST. (e.g. start with DDR4-2666, and then change it to DDR4-2933, and then finally moving up to DDR4-3200). That was the only way that I was able to get the system to POST, so just be aware that you might have to do something similar. Not sure why that is the case, but that's what I had to do to get both of my systems (one AMD system, one Intel system) to work.

Overall Review: It works when it works. It took a little bit of time to try and figure out why the system was POSTing because initially, you can't tell if it was because the RAM modules were DOA or if there was something else going on here. But after setting the memory clock speed, in the BIOS, one stick at a time to DDR4-2666, and out of a total of 8 sticks that I purchased, one of them still wouldn't POST at the DDR4-2666 speeds, that's how I was able to tell that that module was a DOA. But the good thing about Crucial is that they are usually pretty good about RMAs. It took a few days, but it's in process right now. Once you sorted that out and you are able to get the system to POST repeatedly and reliably, the RAM works as normal. Not super fast, but it works. And in most practical use cases, you probably wouldn't really notice any real differences anyways.

Pros: The drive is INCREDIBLY fast. I bought the 180 GB version and it can be around 20% faster than an OCZ Vertex 3 (240 GB) drive. Unfortunately, I don't have the newest CPU/motherboard so I can't really flex it's muscle to the fullest extent, but as a swap drive, it's INCREDIBLE! Cheaper alternative to the OCZ RevoDrive 3 as a swap drive. (I swap a lot -- the result of running full car crash models).

Cons: You do sacrifice a bit of capacity for a given price point when compared to the OCZ Vertex 3. If you're not limited by capacity, then that's not an issue.

Overall Review: I have yet to also test the firmware/SandForce 2281 BSOD stability between the Vertex 3 and the 520. More expensive on a $/GB basis when compared to the Vertex 3, but so far, I'm happy with it. I'll have to do more testing with it to really stress-test it. But it IS still incredibly fast.