I only do them when I go to an actualy Gym to train..which isn't too often anymore. Probably 3-4 times a year right now. Um... last time I did them I put a 70lb dumbell b/w my feet and knocked out an easy 15 reps..so I'm not really sure what I could do(BW 165 by the way).
Anyhow ya...good exercise, I feel it alot in my shoulders though when I want to be nailing my chest/tris.
They've been the staple of my chest routine for over a year now, and my chest is one of my strong points. I do seem to experience a bit of shoulder pain but that's only when working with very near max weights (which for me is +50 or so... I know, I know.)
There is a dip machine in my gym where you sit down and fix your knees under a pad for support. I grip the handles way back behind me and pound out heavy weight for an insane tricep pump.
Aside from that, I stay away from regular dips since they kill my shoulders which holds me back from hitting the chest sufficiently.
I like to use dips to transition from chest to tris during my workout. I put them last and typically need to use more tris by the 3rd set so I get a good warm-up for skulls and press-downs. Of course I've also started off with them to get the most focus. Depends on what else I'm workig that day.
I dont like them for chest as it hurts my rotator cuff, but they have been a staple of my tri routine for years. I can only go up to 3 plates(135lbs) for sets of 8-10, as anymore hurts my precious little tendons way too much
6 weeks ago I was able to rep 3 plates (135) for 4 reps, then I got sick and at my last workout I got 6 reps with 2 plates (90). It's my favorite exercise to perform, after deadlifts.