I ran mine in our local "action pistol" match beginning of the month and plan to run it again at the end of the month. I only had about 250 rounds thru it prior to the match, but it had functioned perfect.
At the match, I ran a brand new glock 33 round mag and had multiple failure to feeds. I swapped to a different mag halfway thru match and didn't have any more issues.
Got it out a couple days ago to try and pinpoint that the feeding issues were mag related and not ammo related, and test the new Taccom extension. I ran 2 full mags with the Taccom ext as well as 2 33rd glock mags that all functioned properly with the same ammo I used in the match. I have been using 115gr factory ammo, but ran a box of 124gr and a box of 147gr thru it. The 124 seemed much smoother and is what I plan to use in the next match.
FWIW, I have heard a report or two that ETS mags have given the Ruger PC some problems, but I don't have any first hand experience yet. I do run the 22rd ETS mags in my 34 and haven't had any issues in it.
I have about 700 rounds thru the Ruger now. We'll see what happens at the next match.