The Gemaco's were a hit. There were two people that indicated they preferred the Copags, but most liked the Superflex's better. I'm also in that camp.
We even decided after about 4 hours, to switch back to the Copags for comparison. No complaints about the Copags, but the switch back did nothing to improve the coolers I was being dealt...
On a side note, we switched back to the Gemaco's late in the session (when we were 5 handed (and only using a single deck). The group confirmed the preference for the Gemaco's.
For the last two hours of the session, I was heads up against a person who was one of the folks who preferred the Copags, and being heads up, I agreed to go back to the Copags due to the amount of dealing involved... In retrospect, it seems like we switched cards a lot, but it didn't really seem excessive, spread out over 9 hours.
Also, we had a freakish power outage in my neighborhood, so the Gemaco's saw some Glow Poker time. Our game hardly skipped a beat. I jumped up, snagged a bunch of LED lights, headlamps, and chem glow sticks, GAME ON!
Here's a pic one player snapped: