The Crosman s34p is the 3BB M3 shotgun and is actually a great clone.
Like Styrak says plenty of people use them: http://www.airsoftcanada.com/showthread.php?t=61948
We have compared them locally in person with the UTG clones and the TM shottys and found them to be excellent airsoft shotguns (once you paint the horrid clear plastic). If you love shottys then this one is great (a friend of mine fixed his TM SPAS by buying one of these and using the parts- it now chronos at 291fps with .2s)
The s32p is generally considered to be crap and thats not far from the truth.