I update my Red 22 to eTap last week. While I love SRAM the 11 speed didn't shift as crisply as the 10 speed on my other bike. I was constantly adjusting the rear derailleur.
With eTap shifting is spot on and the drive train is the quietist of any bike I have rode. Installation was pretty simple and pairing the components did take under a minute as advertised.
I also had no problem adjusting to the new shift pattern. It seemed quite logical to me and I have not had a misshift.
It was also nice that eTap paired to my Garmin 820 with me not having to acquire any additional sensors (unlike Shimano Di2). The summary at the end of the ride tells me the number of shifts on each derailleur. I have also set up a second data screen which shows me my current gear combination (front and rear gear numbers), battery level of my lowest charged battery, and where the chain is on the rear cluster.
Overall I am very happy with my purchase. And yes a friend and I set the system up with out the help of a bike shop.
I love this. I put the eTap group on a 2010 Roubaix and it's a whole new world. The shifting is very tidy, and it's so very clean on the bike. No cables or wires! It's looks amazing. It also shaved slightly more than a pound off my bike. The Red eTap cost me more than I wanted to spend, but I lusted for wireless and this was the only option. I'm very happy with it, but ouch in wallet department.
The shifting, especially in the rear, is very crisp. It feels a bit slower than my mechanical Ultegra, but it isn't annoying at all. Being able to adjust it on the fly with a button on the shifter is a delight. I also bought blips, which ROCK.