I opted out of Nav, because of the price and just use my iphone through sync for directions. You don't lose anything else from the stereo in the NA market, but elsewhere there is a non-touch base radio option.
As far as it being buggy, I haven't had any issues with mine, but others here have had issues with theirs. The touch input lags a little bit, but is not overly annoying, and voice controls work well but you have to remember the commands.
Edit: Removed a word
As far as it being buggy, I haven't had any issues with mine, but others here have had issues with theirs. The touch input lags a little bit, but is not overly annoying, and voice controls work well but you have to remember the commands.
Edit: Removed a word