Ive never used any sort of minimalist footwear previously, but these are such a revelation! I was doubtful at first, planning to use them only for ski mountaineering dry approaches that are too long to hike in ski boots, but short enough that any trail runners will be carried for long stretches after that. So I brought these along on a hut trip thinking theyd mainly be on my pack ... but instead all the skiable couloirs were separated by long unskiable/unskinnable hikes. So I spent most of the trip hiking with all my ski gear and overnight gear on my back. Amazingly, despite all that weight, stability was excellent. Traction was excellent on dry rock (including a marked trail that has surprisingly difficult bouldering, requiring wedging your feet into various tight spots), wet rock, and soft snow. Traction was still pretty good on some lower-angle icy sections. Drawbacks? When scrambling on really sharp rocks, occasionally one will poke into the sole between the lugs bearable, but not comfy (as other reviewers have noted). And traction seemed poor on super-slippery slimy logs, although then again, maybe almost any should would have been too? Obviously not waterproof , or even close, but they also dry out almost immediately. Re sizing, I went my usual size (i.e., same as on the Crosslite 2.0). After ditching the removable insoles (another 1.1 ounces of saved weight, per pair), the tight was still very snug, but since the uppers are almost more like socks (which also probably eliminates the chance of blisters), I think thats the best kind of fit for these shoes.