hey man, i've got an xtrons one in my VT but a little different. maybe mine's a year or so older cos it doesnt charge the iphone 4, but i've now made my own custom iphone dock that charges too..
otherwise the gps, dvd, aux in, radio all work flawlessly, allthough i can't seem to tune in any tv stations but that doesnt bother me.
oh, and the bluetooth is a bit crackly during calls, but bareable, but don't think about using the bluetooth for playing music, the sound quality doesnt cut it.
CAR: VT Commodore Sedan audio car - SOURCE: 7" double DIN DVD/GPS - AMP: Pioneer monoblock / Pioneer 4 ch. - SUB: Kenwood DB+ 12" in 22lt slot ported box - REARS: Kicker RS60.2 splits - FRONTS: Kenwood KFC-S702P splits - MISC: Custom fiberglass iPhone4 dock moulded in center console, White / red LED cluster and dash lighting, SAAS Vortex drivers seat