Squat form check

[steemonkey]

http://youtu.be/ySm2juqu6EY

This is my 85kg squat. Biggest weight I've done.

Any thoughts?

[BareSteel]

Not bad. You've got a little over extension going on at the top, so clench your abs harder to tighten up your descent.

Set your knees farther forward at the top, to reduce the tendency for them to slide forward at the bottom.

If that's a mirror in front of you, try to set your eyes on the wall just below where the mirror ends. Looking at your reflection can be kind of distracting. You want to look at something stationary, like a fixed point on the wall.

[Immortal_k]

Look down.
Bar appears to be in right place, can't be sure from the video.
Stance appears to be alright, can't be sure from the video.
Set your knees forward sooner and follow through with your hips. As BareSteel said, they tend to slide at the bottom and that will cause a bad case of tendonitis. Think of the knees as only going forward in order to allow you to complete the remainder of the squat using your hips whilst keeping the bar over midfoot. The master cue can be helpful here.