Good luck with them. It takes some time to get used to, but once you do they are great. My initial impressions were that I liked sprungs better, but after skating on these for a while I would have to go with marsblades if I were forced to pick one (though both are very good). When you use them for the first time, tighten up the bolt so it doesnt rocker as much. Once your comfortable with that, then loosen it up to make it a little harder to skate and more like ice. Right now I pretty much just always leave it as loose as I can get it before it starts to feel like the bolt is shaking around. If I were to play an actual roller game though, Id probably tighten it up.