I had chain suck when the gruppo was brand new, so in my experience excessive wear wasn't the only issue, but I'm not trying to debate how chain suck can happen, my point was a need for a product for protection. Why risk it? I've seen a chainstay destroyed from one chainsuck occurrence. Repairing CF ain't cheap, and grinding a chunk of my $4000 frame isn't how I'm looking to save weight.

of you are that concerned about it lizard skins makes some stuff that sticks on your chainstay, (got that on my mountain bike) or you could just use 2 or 3 layers of athletic tape...

Got it covered. As I mentioned, I was concerned enough about it and used a small Cannondale steel plate. Tape ain't gonna cut it. Lizard skins were too bulky, still a tape, and just looked ugly on a roadbike. Lizard skins does make a nice protector for the top of stay however.

Sorry to the OP for the thread hijack. Best of luck on the EPS!

Just registered to say thanks for this post- it gave me the guidance i needed to have Campagnolo USA repair my brand new Super Record 11 EPS grupo. Had new grupo installed a month ago ago and within several rides the rear derailleur started to get caught up on a gear when shifting until it stopped shifting altogether. I did the reset, then the reset to zero. it started working again, but only briefly before the problem repeated itself in the same pattern. My local bike shop which installed the grupo was perplexed. They called Campi and they blamed the cyclist - me. i read this post, demanded they test the unit and it turned out to be a faulty power unit. My own sense is that Campi knows it has an issue but is downplaying it.

Glad you got your issue sorted. My problem was with a brand new bike and groupset, campy replaced what turned out to be a faulty power unit as well. It must be a known issue at campy and to be honest I expected better from them. Haven't had any issues since

I love Campy, but I have to say there seems to be an inordinate amount of chatter (not here necessarily) in regards to EPS issues. Is it more difficult to set up than Di2 (which is super easy)? If it is finicky to set up, that might explain some of the issues. Seems like a lot of funky power units, though. I even read a slightly negative review in a popular magazine (Marcel Wust, Pro Cycling), gasp, those guys usually like everything.