Stopped using P&C kits on the 360 after having 2 which both failed prematurely, hence not worth it. I switched to good quality rechargeable batteries about 10 years ago and never looked back.... slight caveat to that is to get good quality batteries. Standard rechargeable batteries will drain of charge when when not in use, which is why i use Duracell Stay Charged ones which don't. I think Eneloop have the same quality and are often recommended.
As for comments about it being a faff...hardly. Just have 4 in rotation and when they get low swap them out with spares already charged up and put the drained ones on charge to be ready when they're needed. Hardly consider that more of a "faff than messing about connecting up the charge cable to the controller and the console regularly...far too regularly when thy P&C starts failing, or even worse just doesn't work so only option is to use it wired or buy a new one.
Regarding the docks, personally I'm not sure they're a great idea as often batteries can deteriorate with number of charges, and these things by design charge the battery every time you put the controller on them, the majority of which won't actually be needed, so don't think that's a better alternative to batteries you use until low and only charge when needed.
Each to their own though and for this exact reason i'm glad MS stick to the AA format for their controllers as it give s people these choices.