I can also attest that this charger works with the Razr Maxx.
I purchased this charger from Amazon and have been using it for over 3 months now. I drive a mid-90's vehicle, which doesn't provide a very smoth ride. The build quality of the charger itself is excellent, has never fallen out or moved, and keeps battery well above satisfied. I go to see my family out of state a few times a year. During my trip and my experiences, with music streaming (MOG app), GPS, Google Navigation, etc. running simultaneously, the phone actually kept at 100% charge while plugged in.
In all honesty, this is the best car charger I have ever purchased.