for real. try them wiz, do 4 sets of 10, then you have my permission to roll around on the floor like a little girl in the fetal position. first off..........1 word. stabilization. this brings your core into the movement so much that you will develop tremendous abb, low back, and oblique strength.
2nd. if you bottom out and go below parallel, the hips and glutes take an amazing beating. which is a good thing if you squat wsb style using the hips mainly.
plus the lower back seems to be a lot easier to keep upright on squats, and deads.
on top of all that,. your shoulders and traps and triceps get satatic ohp work.