I looked at those, drove the 570 and purchased a XP900 EPS. Polaris has the mid-size (500/570) and full-size (570/900 and now 1000). Differences are physical sizes, capacities and horsepower.
And yes they are stupid expensive, especially compared to automobiles and what one gets with them. That said, I wanted one so had to pay the price. I have the steel top, glass front and rear windows, 4500# winch and LED light bar on the roof.
If you are content with the slower Polaris utility machines (less than XP900/1000) I would seriously consider Kawasaki Mules which have a three year warranty and a lot more metal on them than the Polaris. Had I not also wanted really quick acceleration, besides the utility function, I would have purchased the Mule Pro-FX EPS. Stronger build I believe for similar dollars.