This is just evolutionary. This is where tech is headed, and it's going at a decent pace. I wouldn't buy one myself, but for server/workstation apps this will be perfect for some, again depending on price. But for performance, reliability, AND capacity, some are more than willing to pay a premium. These drives are a step in the right direction, and another stage of the progress we're making on solid state technology.
Kudos to OCZ for bringing the field one step further. While not practical for most of us, someday these might be. I've heard the "Oh, for half that I can buy two Velociraptors and put them in RAID 0 for almost as much performance!!!" Yeah, you can, but we gotta start somewhere. Remember back when Zip disks and drivers were all the rage? Flash memory is really where things are headed, and the more mainstream it becomes, and the more they manufacture, the cheaper the unit cost is going to be. This has happened in the TV market, computer monitor market, video card market, processor market, and in other areas. Now we're seeing huge advances and development in the storage market.