Probably not no, not really worth the effort, selling a 512GB M4 may be easier said than done too, I don't imagine too many people buy the 512GB models, especially used ones.
As it happens I just bought a Samsung 830, actually I am just restoring Steam and such now, seems nice and fast so far. Although being on SATA 2 still I can't tell any difference from my old G.Skill Falcon SSD, ...so why buy the Samsung I hear you ask ...I wouldn't have done if the G.Skill hadn't failed just out of warranty. It took a fair bit of deciding, weather to go with the M4 or pay more for the Samsung ...I decided to give Samsung a go in the end as their solid reliability track record and the huge speed of the drive can't really be sniffed at. I know it's a potentially 'dangerous' move, but everyone around here has the M4

...so I decided to try something else ...
no way was I going to be a Sandforce 2881 based drive though.