Ive installed an eGR group on my gravelbike recently.
Must say Im impressed with the shifter ergonomics, they are very small in volume and feel similar to my 11sp etap rim brake shifters, except for the bump that houses the hydraulics.
I have some propper rechargeble batteries in there and thus far its still going on its first charge. Running 12spd with an 11-42 cassette and shifting is crisp and fast.
I did notice that the RD screws were coming loose, as it was mentioned in here earlier, but I just tightened them up again.
I did not do anything special with the cabling and have done some wet rides without a problem. I have found, however, that with my rh shifter, the buttons get stuck sometimes, but not in a shifting position. I do wish they would open the software to enable button setup, as I would much rather set it up to shift in the AXS style.
The brakes work astonishingly well, very light brake lever feel and definate bite point.
Will be testing it soon on some rougher gravel, but till now Im very impressed.