I have skied Pocket Rockets in the Midwest...which is arguably even worse than skiing them in the East!
My husband and I both bought Pocket Rockets because we fell in love with them when we demoed them in powder at Snowmass. Of course, we knew they would not be great 95% of the time back home in the Midwest, but we already have skis that work in the East, and we wanted to have our own skis available for when we travel out West. (Plus, now we are trying to move out West, so I'm very happy to have them!)
Surprisingly, to answer your question, they are not too bad on the primarily groomed ice we usually have to ski on. You can't carve as tight a turn and have to adjust to feeling the ski slip a bit and not necessarily grab, but they work, and the Pocket Rocket at least is quite forgiving and handles variations in snow conditions quite well (like sub-standard grooming and chunks of ice/snow). My husband has gotten to the point where he usually skis his PRs regardless of condition. I still switch back to my old Volant Vertexs frequently, although just for a change I will ski the PRs on our Midwest/East junk on occassion.
I don't think I'd want a wider ski like the PR for my primary ski if I was skiing exclusively in the East, though....although my husband might disagree.