Folks: I have seen both products. The two are VERY different in designs and installation and in their operations. One is like prime steak, the other is like chuck steak. One is plug and play, the other is you must work to make it work. In operation one is macho ... the other is polite. Let me put it this way, if money is not an object in your way of life and if you want to the best, the $800 is the way to go, otherwise go for the "cheaper price" product. it will do. For myself, I like "bullet proof" products. When a product fails, one loses time besides getting stuck, along with the aggravation one has to endure during dilemma and then afterwards to replace it ... Remember warranty or guarantee doesn't help when you are stuck on the road.... Ask both parties for their product brochure and see, if you can find actual working units in a DeLorean. So, do your research and make your decisions. Kayo Ong #5508 Lic 9D NY [Non-text portions of this message have been removed]