OH squats are great. They show up your weakness. If you feel them in your legs then your legs are the weakness and you should not get any greater benefit from normal squats over the OH squats, IF YOU FEEL IT IN THE LEGS MOST.
They really show up your weakness and that is the beauty of them, by focusing on your weakness you make the best progress.
You could find they stress your abs, or arms, or shoulders, or back, in fact everyone could feel them in a different part of the body.
I read one article (Dan John?) where the guy was saying if he could do just one exercise, it would be that.
That's my 2c worth.
I also like one arm deadlifts both suitcase style and from the front, like the old timers, gives good twisting strength etc..
Note that the greater weights used for normal deadlifts / squats have a greater overall effect though in my opinion, but these variations are important.