I was at our annual throwing convention and one of the guys gave a presentation at what had happened at a big gathering held by 2008 OG discus champ Gerd Kanter, who outlined his entire program. Gerd only does pulls no catches for his cleans or snatches, for him he believes risk of injury outweighs benefit.
Kogi Murofushi 2004 OG Hammer champ, also presented, and they showed some video of him power cleaning, he had a very shallow catch, (OL catch a little above parrallel and call it a power clean or power snatch) Kojis back was vertical, and he flipped his wrists over at the top and immediatley drew the elbows back to lower the weight again. Did not catch on the shoulders, until last rep (had a best power clean in this style of 195kg at around 97kg )
When I power clean I do a flip catch at my neck, buy the weight comes straight back down. Can catch on shoulders and do when I jerk, but get more speed and power with straps and my flip catch.