I have a Rubicon 500 but ride with 9 Rincons and the only issue has been with a 2004 model broke a left rear axle. We do not modify them much beyond exhaust, wheels, winches, a few lift kits and minor carburetor/ EFI chips. We ride hard throwing on around 1000 - 1500 miles a year but generally stay up on oil changes and valve adjustments. I would recommend a set of the thickest bumpers and skids available, we all have them and get more than our money's worth! On a straight line shot the Grizzly will beat it, but not by much and the Grizzly has broken down under warranty 4 times now keeping him from outings to Colorado, Tennessee, and a weekend run in south east Minnesota (my favorite spot). The BRP is fast as hell but the only put up with its lack of reliability for 4 months. Rotax built a motor worth keeping but the chassis never stood a chance against the Rincon's. The only Suzuki in the group doesn't make it out, he has less than 1000 miles and broke his differential and has had belt problems even after sending it to 3+ different dealerships. My Rubicon will take them off the jump but they all pass me after 45-50 mph.