Very fast indeed. Just re-installed my OS and a few games onto this baby and it beats any HDD by a long shot. Easy to install and offers plenty of storage for my OS and a few demanding games.
Boots my Windows 7 Ultimate in less than 10 seconds, maybe even shorter but never measured it. Would have M2 SSDs if I had $ but hey, nothing much to complain here.
I had this SSD from previous build. So this was purchased back in December 2014, when SSDs of the like where selling for £80+ I can't recommend getting an SSD for the OS/Browser/etc enough. It's whole new level of responsiveness. Best SSD price/performance wise. The Evo might be faster, but it also comes at a high premium.