I can't give feedback to that particular head unit, but we had a Kenwood DNX7100 in our Honda Odyssey. It was a complete piece of junk. Obviously, it was quite an old head unit (we bought it when it came out in 2007), so maybe things have changed.
Then again, I just did a quick Google search for it. I know they aren't the definitive source for all things audio, but the reviews for that head unit on Crutchfield seem pretty.......bad.
I just looked at a few more....Crutchfield has some 'Scratch and Dent' ones for a pretty good price and better customer ratings than the DNX6180.
DNX5190 - $441
DNX7190HD - $599