I have an RDX and I drove the MDX as a loaner while my RDX was in for service, and I liked MDX very much. The one thing I like about the Acura is that you have basically two pricing options: One with the Tech Package and one without. The Tech Package gives you the GPS and upgraded stereo system. For the base price it comes with heated seats, rear-view camera. sun roog, leather, rear A/A and Heat, All Wheel Drive. I priced other cars with the same options and they seemed to be at least $8-$10K more with all of the add-ons. The Acura GPS system is very nice. I've read in this forum that a lot of people do not like the Mercedes GPS.