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As someone who has made the switch, I think its worth it. The stability and weight reduction was a noticeable improvement with the R1 chassis. You also "sit" lower on the R1 chassis (which probably contributes the aforementioned stability).

Their boots are top notch, at least for my needs. I just converted a pair of TF7 ice boots to roller with Marsblade O1 chassis. I have no intention of playing competitive roller, so went with the chassis designed for training, not competition. Don't think I could ever go back to a rigid chassis even after just a few sessions on mine. I also have a pair of TF9 ice boots that rock. If you have a medium to wide foot, they should work for you, although I've heard they made some modifications to the roller boots compared to the ice versions. The ice boots work for me and are definitely the most comfortable boots I've ever used.

Well, Bauer rollers are built in the Vapor last and Mission rollers are built on the Supreme last. So size 6 in both would be your most logical bet. I'm assuming you already figured something out, but just putting it here in case