It's been my professional experience that a nice percentage of drive failures happen because of the logic board going out, not mechanical. Of course, it could be the heat that's killing them.
It's too soon to tell, but I'm a little skittish regarding SSD technology. It's getting better, but I'll wait a few more product generations before using them in SQL servers. With HDD crashes, at least the data can be professionally recovered to some degree. But what about SSDs? If the controller dies and/or a PSU fries every chip, I'm afraid all the data would be lost forever!
Only a historical record of this new technology will determine my level of trust in the future.