I have the z6 and it's not that bad. The rzr 570 will leave it in the dust. The z5 I think will do better. It doesn't have a wet clutch so more power will reach the ground. I did check on the weight and it does look like it's a a little bit lighter than the z6 also. I do get out to spots that are hilly, after tuning the clutch a little I'm not worried that I won't make it up a hill. If you are willing to pay the extra money for the z8 than you probably be pleased with it. More power is always nice to have. The z5 can't be compared to something putting out almost twice the hp. If you keep that in mind than the z5 will be plenty of fun, especially at the price you pay.