Modern SSD drives have a MTBF (mean time between failures) as good as or better than most consumer hard drives.
They have a real advantage in seek times for small files (virtually nonexistent). Read performance is generally excellent. Write performance is the major downfall, however. When an SSD has to write to an area that previously contained data, it has to go through two operations. First, it has to erase that block, which is an expensive operation time-wise. Second, it has to do the actual write operation. In effect, when the drive is brand new, you'll see amazing read AND write performance...until you've written to every block on the drive once, then you have to begin erasing before writing, causing a sudden performance drop-off. That kind of variation makes an unpredictable media drive. Unless you like inexplicable -9073 errors, I would stay away for now.
This anantech writeup will give you more information about it than you'll ever wish to know. =)
http://www.anandtech.com/storage/sho...spx?i=3531&p=8