pretty good fast hard drive but below a pro with 840 SAMSUNG him who consumes little more active and standby. but this album is interesting (M500) if you need a big capacity. level speed my mac lights 25s against 15 of 840 pro, if you do not need 1to prefer the SAMSUNG PRO 840 more with a 5 year warranty against 3 years in CRUCIAL. I have the M500 as big need room and I hate to burden myself of external drives. after there EVO SAMSUNG home but with TLC memory may be they will make discs with MLC ???