I've got the maestro mus1 (dashkit) and the maestro rr (for retaining steering wheel controls - programmable) with a kenwood dnn770hd. The mus1 only works with certain kenwood units as the climate controls are removed and moved into a screen on the radio. It also display gauges (RPM, MPH, battery voltage, tire pressure, etc).
IMHO nothing else compares and you don't need sync. Here is my install
How I like it. I love it! The kenwood does take a long time to boot up so that is annoying. It is somewhat sluggish between screens (this isn't long enough to bug me but it does others).
On the cost front I did the install myself and spent $1100 on the dash kit, control unit and the head unit. I posted the link to my purchase here