I have a few miles seat time in an HD10 Defender and I can tell you they are leaps and bounds better in ride quality, fit and finish, comfort and power than Polaris and John Deere. They are truly the best in their class, hands down. I would have no problem with the HD5. After all, it’s a Rotax motor. They have just shy of 40hp I believe, which is impressive for a 425cc engine…Honda has been trying to get that kind of power from a 420cc engine for almost 20 years…
Hope my input helps.