I am interested in a 525, I have read up on here about them, but what do I really need to look for when looking at one. Are all years the same pretty much?

Do I really want the irs for trail riding? I have never had irs before, but it looks like a lot of extra parts that will wear and break compared to the straight axle. Does one handle a big butt better than the other?

How do these machines hold up?

For a little background, I am on a Sport 400 right now. I have had Banshees, Scrambler 500’s, even a 350l 4×4.