Greetings,
Six months ago I purchased the 570 SP Hunter Edition. I've put around 350 miles on it since, all on dirt. Not a ton of miles, but I've been able to get it out nearly every weekend since bringing it home.
I have not encountered one single issue with this ATV. I absolutely love it. I'm not sure if it's just the power steering, the double A-arm suspension, the radial tires... but it handles extremely well for what I ask it to do. The motor is a really good down low and in the mid-range. I've never tried to get it to a top speed, and probably never will. The features are perfect, and all Sportsman owners know what I am talking about... great storage, great seat comfort, etc. I've said before that the new digital gauges are great, and still feel that way... love it.
I see some posters complain about the engine braking on the 570s, or other models in general. It is stout. Fortunately, this is the second Sportsman I've had with this feature, so I was able to get the perfect throttle feathering quickly. Rarely do I need to use brakes. If you're considering going away from this ATV because of engine braking, I would suggest reconsidering. You can't get the feathering down pat on a dealer test ride. But following the first good ride or two, you will have it licked. It becomes an absolute non-issue. In my view, way more upside in having it than not for my type of riding. I'd like to hear from those that ride in the mountains a lot. Maybe they have a different view.
Anyway, just sharing my thoughts so far. I hope this provides some perspective for someone that is searching for opinions before making a purchase decision.