I have Burton Cartels, pretty nice although I'm thinking the mediums are slightly too roomy for my size 8 boot (Burton Ions). I bought the Union Atlas after reading the review on TheGoodRide.com. I am very happy. I got the size small and the fit seems perfect for my boots. I rode the Atlas 6 days straight at Whistler and they were really, really nice. Mostly on a Jones Mountain Twin (great combo) but also had one day on a Custom X (channel board, used $10 conversion kit). Regardless of board, these bindings felt great. I had heard the toe ratchet was always sticky on Unions and that the toe strap was no good. I must disagree - if you can't operate the toe ratchet you must be mentally challenged. And, using the traditional "on top" position for the toe strap the fit was secure and stayed put all day. In short, these have replaced my Cartels (which were just fine btw) and I highly recommend the Atlas.