I got it in 2014 because then, in order to get hydraulic shifting, I had to get it, as it was bundled when first released. I have zero regrets. I went from friction down-tube shifting (which I really liked) to Di2. I never owned a bike with mechanical "brifters." I do now (Campy on mine -- replaced the friction shifters, 105 on a couple of family bikes, etc), and I never really got used to the levers and find Di2 much more pleasant to use. The feedback is in the cadence, not making my hands hurt (this is hyperbole for me, but my wife has arthritic hands, so her new bike is going to have Di2).
The battery recharge is a non-issue. I let it run down intentionally when I first got it, just to see firsthand what would happen (stops shifting in the front first). I charge every 4 to 6 months, and haven't been caught out.
My only objection is vaguely philosophical: you shouldn't need to charge a battery to be able to ride a bike. But I got over it pretty quickly.