Price new, the reason I went new was because used was literally the same money.Well that's a tad broad and rather limiting. Of course I could argue that you can save several hundreds if not thousands of dollars by buying a late model, used ATV that is nearly new. I'll admit you're always taking a risk though. All in your perspective I suppose.
Every manufacturer has their problem models and years. I'm just trying to avoid those.
XP is different in almost all respects from the 500. Different technology vs the McPherson's on the 500. They barely resemble each other other than they have 4 wheels (different sizes) and have a center pod light (again totally different design there even). The XP from 2009 to 2014 came with either an 850 or a 550 engine choice with body and some engine modification each year of production depending. They are now offering a 1000 as well.
Most of the melting is on the 570s and 850's. I don't think I remember a non-touring 550 having melt issues. Rare engine issues are only on some early 550's from '09 to maybe early '11. Anything after that seems really solid.Search around but I've heard lots more complaints about the 550s (not quite ready for primetime) mostly on heat melting plastics but some engine stuff too.