foot rig

I have been looking at several different foot rigs, and all of them look rather complicated to make. However I just finished a foot rig that was much easier to put together and not near as complicated. I am knew to this stuff though and not sure if I’ll will run into problems later with this rig, so I was just wondering if some of you guys could look at it and give me some comments/crits.

http://www.savefile.com/files/418521

The only two bones that you need to move are foot.L and flat.L. foot.L moves just the foot and not the toes, while flat.L moves the entire foot and the toes.