I would argue Samsung has lost its business from me due to their sloppy way of handling the 840/EVO issues. Their reluctance to fix the original 840 and OEM drives is unacceptable. I now have to rewrite the drive every two months or so (Diskfresh) to prevent suffering from extreme read performance drops to ~50MB/s. Sandisk is alright (my parents have one of the earlier Extreme models that would freeze due to the SF bug, but it was later fixed with firmware), but I haven't see many new models from them lately (Extreme 2 came out awhile ago). I think the largest players are Crucial/Micron and Samsung, the rest all kind of dropped off the consumer market or command an increasingly shrinking market share (Corsair, Plextor, etc.).