I purchased this unit and have done a custom install in a 1999 GMC Sierra. The installation and wiring of the unit was straight forward. The Video quality and audio quality are fine. So far all of the features I've tested work as they should. I also have the NaviBox-1, but am still waiting for Epsilon Electronics the parent company of Farenheit to send me the adapter cable so I can connect the GPS interface cable to the Head unit. The parts dept lost my first request for the adapter. The adapter cable doesn't come with either unit, but it is free if you call Epsilon/Farenheit parts department and ask for it. The manual that comes with the Farenheit product isn't the best and leaves you with questions on some things. Epsilon/Farenheit Customer service is one of the worst I have ever encountered, although when I was able to contact tech support or parts they were helpful. So bottom line for the price it isn't a bad product and if the occasion arose again would consider purchasing this unit again.
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