I have them on 4 of my bikes. Two are the first generation but still work well. I did replace the Archer batteries with an aftermarket brand though, when the OEM batteries failed. I only have to charge them 2 or 3 times per season. The problem I had was getting the batteries out of the shifter to charge. I just about had to stand the bike on the front tire so they would slide out. I eventually started using a magnetic pick up tool to pull them out. I complained to Archer about this and they began selling a "battery extractor" tool which used my idea.
The other two shifters are the newer gen 2 version with lithium batteries. They hold a charge very well. I eventually bought the battery adapter which lets me power the shifter from the bike battery, so no recharging is required.
Archer did have some problems with the product but, worked them out by letting customers do the beta testing. I guess this turned off a lot of potential customers. By the time they released the gen 2 version, there weren't many takers. Too bad, since the new model is bullet proof from my experience anyway.
The concept of an e-shifter that uses almost ANY derailleur is a sound idea. Unfortunately, there are no other e-shifters like this on the market. If you want electronic shifting, you have to spend big bucks for the likes of the Sram AXS derailleur.
