Just traded my teryx4 in on a 2014 RZR 900 Stealth Black. I don't believe the build quality is near as good as the Kawasaki but it rides smooth, is quiet, and a whole lot faster. Since I went from 4 seats to 2 we decided to buy an Ace 570 for my wife. We had taken my Rzr out a couple times and I was blown away with the power and suspension. I assumed the ace would be able to keep up on the trails and would be an excellent machine for her to learn on, but the Rzr should be a lot faster and smoother right? Wrong! On rocky trails it actually rides smoother and when we took it on the sand this weekend it was actually faster than the Rzr. We ran them 4 times in 4wd and 2wd and every time it was the same result. The ace would get the holeshot and Rzr would dig, but even when I got moving she was still pulling away. At 300 ft she had 2 lengths and it was clear I wasn't gonna catch her. Both machines are stock except wheels tires. I'm running 28" roctanes and she running the 27" bighorns that came on my Rzr. I couldn't believe it, it didn't make me like my Rzr any less, but I absolutely fell in love with the ace after just 1 ride. Hands down the most fun atv/utv I've ever been on. I'm very pleased with the purchase.