Im not quite sure why this has god bad reviews (unless people got a bad batch), I ve had this for over 2 years now and its perfectly fine. The batterys charge in good time and last for a long time too. Think it is much better than the play and charge and also other versions as the batterys have a good weight to them and give good feedback when the controller vibrates. Im am now buying the batterys again after 2 years as with all rechargeables, they dont last forever.
I would have given it 5 stars but the charger has started to crack where the battery sits in the cradle.
Having had the plug in and play charger for a while I started to have a few problems with it as it would either not charge my battery at all of it would take hours on end to charge after messing about for arount 30mins to get it to charge in the 1st place(No joke), So enough was enough, I splashed out on this bad boy and it is a much better bit kit, it charges your batterys sooo much quicker as it is run of the mains rather than a USB port I can fully charge a battery in around just over an hour, And on the plus side you get an extra battery with this charger, so If you are looking for a charger for your 360 I really would recommend this one over the plug in and play charger. this one is quicker and a far better bit of kit and does not drain power from your 360.
The comments about saving money on batteries is what i thought about the minute i bought my 360 but i had to ave this cos i was getting annoyed with my xbox staying on after id switched it off just because the play n charge kit was plugged in. The only downside to this (i may be a little picky here) is a really high pitched squeek that's coming from the quick charge docking station only when there is a battery charging! Is this normal???????? Another funny thing i've noticed is that when you unplug the cable from the dock or the plug from the socket, if you listen closely, it sounds like it's going to explode :)