If you need very high sequential read and writes its great. But the random read/writes are not as good and some of them dont support TRIM, so in my opinion they are overpriced. Often cheaper to buy two SSD sata drives and raid them for similar performance.
To be honest the revodrive is flawed , However if you havent got Sata3 or an OS that can fully utilise an SSD then the Revodrive is an excellent upgrade .