Love using the t-nut and bolt system. I know I can swap out holders and switch from roller to ice in about 20 mins if I really have to. I use mako's for ice, but recently had to send them back for warranty because I get the mako bump/cut so badly. All I have to do is grab one of my roller blades and pop on a cxn holder and I can use those for now. As for the marsblades, I like them a lot. Right now I actually am trying out three different roller chassis to see how they compare with each other. I was able to get vapors for cheap, so all are mounted on the same boot more or less. Im testing out marsblade, sprung, and hilo. Gonna write a post once I have a little more experience with marsblade, but so far I can tell you that they all have their strengths, and there is no "best" of the three. Still forming a opinion, but this is what I think so far: - Marsblade: Feels the most like ice skating, and activates the muscles you need for ice more than others (especially when loosening up the bolt). I think its better put together than sprungs, but the magnesuim hilo frame is obviously the best here. Turning is probably on par with hilo. 72mm wheels might be the reason these feel slower than others (brand new bearings always feel slow to me until I clean them the first time - this could be the reason too). Still need to test these more - Ive only used them a handful of times compared to a ton with the other two. - Sprungs: Feel very similar to hilo, but you can tell that there is some rocker action going on. Feels a little like ice skating, but not as much as marsblade. Turning is crazy good with these because you end up with two wheels on the ground sometimes. I feel maybe slightly faster in these than hilo's. Build quality isnt that great - Parts are replaceable, but Ive had my problems with them. They also dont feel as together or as tight as the other two. There is a lot of rattling when skating. Had to add a shim to get them to feel like ice skates. Great grip with these, not sure how marsblade compares. - hilo: Fast and tight - no worrying about any rockering mechanism. Most durable. I think all three are very good, and serve different purposes. If you had to choose just one, I would choose marsblade if you are primarily an ice player, who does off ice training, and occasional roller hockey. If you just played roller, it would be a hard choice between sprungs and hilo. I think either would be fine, but i guess the decision would come down to personal preference. (Again I have to mention I dont have as much experience with marsblade, so it might end up being the all around best, but for now I can pretty confidently say its the best at simulating ice skating) Will update in a few weeks. Lemme know if anyone has any questions.