I've never had kolpin but I read a bunch of reviews like the ones above before buying my rotopax. They've been through hell and back with no issues. Pricey, but worth it.
2012 Sunset Red XP 850 HO EPS- Everything.....
2010 Sunset Red XP 850 EPS;6000K 55W HIDS, Deluxe front and rear brush guards, 3500lb winch, heated grips and thumb, front and rear rack extenders, polaris hand guards, (2) 2gal Rotopax, Lock and Ride Gun Boot, Lock and Ride Rear Cargo Box
2009 XP 550 Browning Edition- Stock