I purchased the Quick Charge Kit on sale from Dell.com for $10, up until then i had always used the play and charge cable, and found it worked quite well. But it was such a great deal i couldn't pass up the Quick Charge Kit. I figured it would be good to have so my 360 would not have to remain on so much to charge my controller battery (the 360 will remain on in charging mode with the play and charge kit until your battery is fully charged). The kit comes with the charger, cord, and 1 battery pack. Everything is sleek and white to match with the style of the 360, and it works just as advertised. You pop a battery into 1 of the 2 charging slots and a light will come on indicating it is charging, a few hours later the light turns green to let you know the battery is charged and ready for play. This works good, and is nice to be able to charge your battery without having the 360 stay on. However, you really need 2 battery packs if you intend for this to be your only solution, if one goes dead in the middle of the game you need one to switch to or you can't keep playing.
In the end i am happy with my Quick Charge kit, but i am not sure if i would be willing to pay full price for it. The play and charge kit is a more complete solution for roughly half the price (if your battery goes dead you plug in the cable and keep playing) but the Quick Charge does allow you to charge batteries without your 360 being on. It's really a toss-up, and depends a lot on the individual buyers situation.