wireless shifting

I've got it on my Solaris Max.

Pros - It looks great, gives a really clean install with the lack of cables and the shifting is perfect.
Cons - It's not cheap.

Personally, I think it's great and wouldn't go back to cable shifting on my bikes.

The only other possible downside is that the battery life isn't as good as Di2. I've never had a battery go flat on a ride on either this bike or my old road bike which had etap. Batteries are cheap enough so it's easy to carry a spare if you're doing multi day rides.

As for how it works, its just a case of pairing the shifter and mech then fitting it.
The mech seems to be sensitive to the straightness of the mech hanger.
In use the shifter takes a little bit of getting used to as it's like a rocker switch rather than two push switches like Di2.