Summary: Don't take my word for it. A little searching and you'll see this is quite common with this drive.
Pros: It's an SSD.
Cons: This drive worked for while before giving me issues. I read that my mobo might not support SSD as it was an older system. Went back to my RAID0 x 3 and put the M4 off to the side and forgot about it as I could live without it. It's been a year and I have a new system as a home server. I can now verify it's a bad drive. It has the latest firmware and has this disconnect issue. Programs stop responding before Windows itself crashes. After the reboot the M4 isn't even li...
Cons: Unreliable. This is my 3rd RMA from crucial. Every drive I have received works fine within the first few months, then roughly at the 1 year mark, it starts to cause system freezes, BSODs, the works. Talking to technical support is useless. They tell you to try a different sata, update firmware, and power cycle. Once you do all of that, they run out of ideas. Skip the pain of going through RMA's and replacement drives. Get a different brand.
Summary: Worked okay for a year, then died. First time I was able to get it operating by unplugging it but only worked for a couple of days, now completely dead. With all the lost data I'm not sure if I will bother with the RMA. Easier just to buy a different brand.