If you're talking about MFT, it's not too bad. I like having the information there, and the larger backup camera. It's not perfect yet though. They still have some work to do, I get some freezes every now and again. It's still better than my Pioneer NAV in my DD.
Sound quality is pretty good. We had a Bose system in the Infiniti we traded, I prefer this over that system. It has it's limitations, but if you aren't a kid or a complete Audiophile, it's nice.