I got a pair for x-mas and now I have Deltas. The Revolts have a tiny "base", lots of flex. The bolts that hold the base to the heelcup would not stay tight! I tried loctite, didn't work.........broke 6 of the plastic "shim" pieces on the outside of said bolts. The "wedgie" footbed design on the Revolts is retarted! The bolt to hold the "wedge" is at the back, under your heal. Constant "flexing" breaks the plastic so there is nothng to hold the "wedge". Even at 50% off, I would spend my money on something else!