I have the older version of this, the N1 in my Mercedes. I haven't upgraded yet due to the newer safety features which blocks out the user from adding a new address while driving, or watching DVDs while driving.
That being said, Pioneer, IMO, makes the best navigation systems on the market. The Z1 is beyond anything else available.
The main issue with these pop-out units (N3 vs Z1) is that the motor for the screen usually goes bad around a year if you have it set to go in and out everytime you shut the car. Either get an extended warranty or don't have it set to go in and out everytime.