Cool, cool. Ass to grass is the way to go. The reason I ask is I have literally seen no one at my gym do them since I've been here (then again I don't see many people squat). I agree though, they definitely blast your quads.
\DBs. My gym doesn't have heavy enough KBs. Yeah, I seem to be. I am doing 100lb DB now. Not sure how high I could go though since I'd be holding a DB. Also not sure how much I could do now with a regular squat...I should see. I find them easier and more accessible than using the squat rack. Most of the time it's taken at my gym.