But the DO fail! (Become corrupted and the OS will no longer boot up). I had one in my late 2011 Mac Book Pro 15" for several years (a Critical drive) and it was blazing fast, compared to a 7200 rpm 750 GB hard drive that came with the unit, BUT one day, the thing hung, I did a force quit, and then on restarting, the thing **** the bed, ruining a couple of flat file databases (Together 3) and the OS, even when reinstalled. I then got a Samsung SSD, which is said to be more reliable and is definitely more expensive.
So, the lesson here, is same as a hard drive: backup religiously and continuously (Time Machine, Backblaze, etc.) or face the consequences when the inevitable day of reckoning comes. And also, if you rely on computers, it isn't a bad idea to have a "hot" backup and use two relatively duplicated networked computers for when one is in the shop -- I now am using my MBP as my backup computer and a new 27" iMac as my main computer. The beauty of this is that you can use the same software on both through the app store and buy only once and there aren't licensing, copy protection or "per seat" issues on Mac OSX machines that there are on Windows...and yeah, the iMac also has a SSD and 32 gigs of RAM...very fast as well!