This charger cable is great if you already own a rechargeable battery pack (and no charging dock), or if you just want to play with your wireless controller when your AA batteries die.
If you're looking for a charging solution, I recommend
Xbox 360 Quick Charge Kit - White (Xbox 360). The battery will recharge 3 times as fast than any Play and Charge kit can. If you're just looking to be able to plug in by USB when no batteries are avaiable, this'll do the trick. You will still need to have the Wireless USB receiver plugged in as the cable does not send data down it (though easily could if Microsoft had so wished).
The overall build quality is decent and the Charger Cable by Datel has a 10ft length to it. The product's packaging however was more than adequate at keeping me out. This is not an official Microsoft product but works as intended.
I'd pay £5.00 for this cable again, but let's hope I won't have to!