Two things:
1. Buy from a reputable source -
Punter bags 500GB SSD, finds 128MB Flash inside ? reghardware 
2. I snaffled a 256Gb Crucial M4 which is the primary disk in my Macbook Pro. Used, therefore £260 compared to £350 or so retail but only 2 months old. Has made a hell of a difference especially when running lots of virtual machines.