I bought a pair of these around May, and just had to retire them. Unlike other synthetic uppers/linings, the perforated Prisms stretch... A LOT. Climbing 3-4 times per week for 3 months had them stretch about 1 full size on me, which was far more than I expected for a synthetic. In the end, they had stretched so much that the laces were bottomed out, and I could no longer tighten them enough to prevent my foot from rolling inside the shoe when I edged.

In addition the combination of the chisel tip and the super soft Onyxx rubber runs into problems as the rubber breaks in. I found that the side and upper rubber stretched about a quarter inch outwards over the chisel tip, actually making it more difficult to edge. Also, this caused the sides to show much more wear than I normally see.

Finally, while the very soft Onyxx rubber is amazing for slabby work, I found the combination of it plus the extra soft last to be extremely painful whenever I put my feet in any crack and cranked.I would buy these again if they were redesigned with a stiffer rubber/last, a reworked chisel tip where the sides did not bulge over the sole, a non-perforated synthetic upper (or synthetic lined leather), and a snugger heel.

Oh, and just like seemingly every other synthetic shoe, they will smell putrid if your feet sweat a lot. This did not factor into my rating, but others may want to consider it.

Quite pleased with these. I picked them up to replace a pair of 5.10 Prisms that had overstretched. I compared the VS against the Miura laceup and Evolv's Pontas. My feet are pretty flat, with a low arch and wide front. The Miura laceup had a weird dead space above the toe, and the Pontas was too narrow. The VS just fit my feet perfectly, and had the added bonus of a downturned toe. So far, I've only used them bouldering in the gym, but they have amazing edging and cling to holds on overhangs. In addition, the last is stiffer than my old Prisms, so I'll be able to use them on outdoor sport routes without feeling like every crack is torture.

For sizing, I went with a 41.5 compared to my size 10 (43) street shoe. I also found the "size 0.5 down from Miura" to work. I went to a local R*I to get base sizing off those, then was able to confidently order the VS online.