Rzr air cleaner problems are pretty well known. hard to get a good seal everytime with the factory air filter setups. I had to rebuild my upper end on my 570 due to dust ingestion. I know of several other rzrs in my area that had the same problems. General build quality is poor. My planned mods are similar to what I have done to my RZRs except for the ones Honda has already engineered correctly. I don't have to come up with solutions for bad air filters. I will definitly be getting a roof and windsheild, mirrors. I will be putting on radial tires but I am impressed with the stock tires on the pioneer. My RZR had 2 ply tires is all. The stock pioneer tires are really pretty good compared to many stock tires. I had one of the first 570 razors and took it to UTV tech for full skid plates and A arm guards etc. They used it for their tester so all the cool stuff was free, about $1200 worth of free stuff. They are probably going to do the same thing for me on the pioneer. I had one of their storage boxes in the garage that I never used on a razor and it looks like I can modify it pretty easily to work in the Pioneer. If fox shocks ever come out with shocks for the pioneer I would get those ASAP. They transformed my 50 inch rzrs into great rides. I am sure EZ steer will soon be making a power steering unit for the pioneer. For $600 it is a great mod. I have some wheel adaptors coming from SUPER ATV that will let me use all my 4 on 156 polaris wheels on my pioneer that uses a 4 on 110 bolt pattern.