I've got around 2100 miles on a new eTap AXS (Red) bike. I was a bit apprehensive going SRAM considering I'm a long time Shimano user.
So far, the AXS has been fantastic. No issues whatsoever, the "4 batteries" for me are really two as the brifter batteries need chaining once a year. The derailleur batteries charge very quick and I get hundreds of miles between charges - I've never been even close to running low on a ride.
I got used to the different shifting method in no time and my other bike is Ultegra which I still ride also.
Having said that I'm absolutely sure I'd have loved a Di2 setup also.