I'm not convinced on them yet... To my thinking, you can RAID-0 say 4 fast 640G or 1TB 7200 spinners, get 10 or 12 times the capacity and about 2x the I/O speed for the about half the net cost as a single 256G SSD. Granted, the array will use more energy, but doesn't suffer from the stutter and read-write issues of SSD. Granted again, putting 4 SSD's in RAID-0 sounds very cool, but the cost is currently prohibitive.