Are you sure it's legit? That's an incredibly low price, and almost too good to be true. Also, the SRH940s are a lot more neutral than the M50s, and will have an increased treble presence and less bass. Be sure you like this kind of sound, or you might find yourself preferring the M50s anyway.
Thanks for all your help first off. :D Also, yea, it's legit, it's pretty much like new, but it is used and he can't find any buyers for them so I guess I'll take them. Also, If I end up not liking them as much as the M50's I might just sell them again, maybe here on Head-Fi. I might also be getting DT770-Pro's, just because I want some really bassy cans for certain genres, DT770-Pro's are good for that right?