Having just experienced my Vertex 2E failing to wake from a S3 sleep, and reading of the many many other within the OCZ forums, I was hesitant from buying another. This also applies to the Corsair drives.
Even though the Vertex drive was 12 months old my retailer went way above and beyond what they had to do and instantly swapped it out for a brand new M4, so I was well chuffed. Fitted my M4 yesterday when I got back from my retailer and it already ahd the latest firmware and seems to work fine, then again so did the Vertex.
On paper the drives with Sandforce controller perform really well and for me mine worked for 12 months solid. But if the Sandforce controllers seem to be problematic over that of, for example, the Marvell I can't see a point in buying one.
The Plextor SSD's also use the Marvell controller and I have one in my HTPC.