For back squats, I don't know that it matters so much so long as the sole isn't squishy. I can probably squat just as much in a minimalist shoe as with an oly shoe. Where they really shine is whenever the bar is overhead. It helps to have a completely solid base. The angle helps some in front squats and OH squats. But it can also be a crutch for poor ankle flexibility. Reguar lifting, you can just get a minimalist shoe like a nano or similar, and call it a day. Because with the oly shoe, you are not doing box jumps, running at all, jumping rope, or even jumping down from a pullup bar without potentially injuring yourself. This is one of the reasons they make in between variations, which I've tried. But I decided to just change shoes. Now my gym bag weighs 87 pounds.