Great. Firstly a great place to keep controller when not in use. Looks attractive. Nice red light for green for charged.
But here is why to buy.
My batterys after time started failing and didn't really stay charged all that long. I got one of these and my batterys stay charged much longer and the batterys that had not been holding charge now are like new. I am not saying this will fix any old battery packs :) just that it does a very good job of charging much better than the play and charge kit in my opion.