I’m on the fence with AXS. I had it on my previous bike. I currently run UDi2.
There were some things I really liked. The shift logic is super simple, the wireless is clean, and - the biggest for me - was the gear ratios. 48/35 and 10-33 solved a lot of problems for me, some of them admittedly theoretical. Indeed, tbh the 48-10 and 35-33 combinations saw very little use, but if I was planning to take the bike abroad - this is pre Covid, obviously - they are ratios I’d want, and that setup gave me them without any hassle or extra spend. It would also be an easy bike to travel with; just pop the batteries into hand luggage. I liked the way it synced to my Wahoo without any extra wires or spend, I liked the app, and I liked the reassurance of a spare battery in my jersey pocket, though I never used it.
I wasn’t wild about the weight, though in the real world I think it’s c.300g max heavier than UDi2, and unless you’re a high-level racer at the sharp end of a mountain finish that’s an irrelevance. It’s a bit more spendy than UDi2 but again, neither is cheap. Both points in UDi2’s favour, but not deal breakers.
The discs rubbed a bit but then so does my current Shimano UDi2. Weirdly, the 105 setup on the winter bike almost never rubs, and the brakes are at least as powerful, but that’s a side issue. Stopping power was about equal.
What I really didn’t like was the AXS FD. Chain drops weren’t an every ride occurrence by any means, but they were common enough always to be in the back of my mind. And to make it even more unpredictable, it wouldn’t happen for 5-6 rides, then would happen twice in 20km. My current UDi2 has dropped the chain once in over 2000km.
Having weighed all this up, my incoming bike has… Campag