I just happen to learn the Volquartsen took over the PWS Summit. I was a bit surprised.. Shows how well I'm keeping up with things.
Any case I have a PWS and I probably would recommend getting the Volquartsen unless you want to do some work to get the PWS working fine.
I had to sand the bolt a bit to keep it from gouging the rounds. I had to bend the extractor so it would retain the shell casing. It wouldn't hold the shell casing and would just drop in the chamber. Drove me crazy. If you cycle fast then it might be okay. By bending teh extractor (which is also a Ruger 10/22 trick I read about) it has a solid hold on the brass. I forgot what else I did, but those are the main ones off the top of my head.
If your not shooting suppress I'd say get something else.. but if you want quiet shooting suppressed, the Summit definitely works great.