Box Squats
 

What sort of height would you choose for box squats? Would a standard bench in most gyms work? Are there any form benefits from slightly high box squats that could carryover to regular squats?

Also, do you "sit down" on box squats, or prefer a "touch and go" approach?

Usually the height is around 14 inches, most benches would be too high for that.

The benefits aren't really dependant on the height of the box, the real benefit is in the correct execution of the lift. The way I see it is this:

1) Using the box to squat as you normally would. The benefit here is just solely to gauge depth.
2) Using the box to actually squat back and down to in correct box squat form. The benefits here are huge and numerous in my opinion.

I've written a little about Box Squats here and I may expand that to a full article at some point. I may even do a little video on them if there is sufficient interest.

Always. We should really start a MAB video section for things such as these.