I have M2000 & brother-in-law has SX3 he paid $1000+ we've only put about 50 shells through her - runs fast!!!, skinny stock (more then I'm used to & takes some getting used to) fairly light, easy to handle & aquire target (I'll give more feedback after this weekend at the range) Then I own a Stoger M2000 (first model) and love, love, love it!!! Never an issue, runs everything, the perfect bush boomstick, good with clays and what a price picked it up for $550+ on sale at bass pro, came with 2 barrells (28" & 24") 5 chokes and 2 butt stocks (standard & sureshot) I'll stick with M2000 --- bang for the buck is probably best of any firearm I own.
FYI - M3500 is NRA's 2012 shotgun of the year!!