We have one, excellent product. Ours has a built in satellite receiver as well as the usual digital receiver. Some say they are expensive but the best quality products usually are!!!
take a look at the Cello tv.s just as good at half the price, I have had mine for 2 years now, without a hitch, and it has all the gizmos of the Avtyex ie, satellite/freeview and dvd player with usb ports.
Quality need not always cost more. We bought an ALDI TEVION for our first van in 2008. It was equipped with 12volt as well. The next van came with an Avtex (not free, it was in with the price of the van) We still use the Aldi one at home. The one we have now is almost a year old and was not included in the van price, we added it on as one of the extras that could be bought at the time when we bought the van. This one is also an Avtex. No problems with any of the three of them at all. In fact the Aldi one will soon be moved from the dinning room to the bed room. We tend to be in bed longer these days. LOL