I installed the Pioneer AVIC-Z1 about 5 weeks ago. Along with the IPOD interface, Backup Camera, and Bluetooth adapter. Might have been better off waiting for a Z2 but got impatient. They are identical hardware but updated maps.
Only complaint is an echo (on the other person end) with the Bluetooth. It's well documented and there are fixes that I've not yet inrcorporated. I don't really use the bluetooth much but it iss nice to be able to answer the phone without having to dig my phone out of my pocket. Otherwise I love it. Eveyone loves the rear view camera, and I can hitch up my trailers in one shot!
I'd do it again in a heartbeat!