Last I heard the the Edge is not approved to run in California except offroad (no biggy) and it is not recommended for flex fuel vehicles by the manufacturer (Edge)....
"In California, the Edge Evolution is only legal for racing and off-road vehicles and may not be used on the highway.
Flex Fuel Vehicles: fueling with E85 is not recommended in conjunction with your Edge Evolution unit. Burning E85 reduces efficiency and power compared to using gas, which nullifies the effect of Edge Evolution's programming. "
Also everything I have heard to date says that the shift firmness is the only benefit seen. Fuel economy is the same and little to no performance gains except for the diesel crowd. Also heard of an issue or 2 while towing in Level 3....
Overall most would buy it again because it looks cool on the dash and it has most of the benefits of a handheld. It has the added capability of monitoring the truck and has an accelerometer feature that has a "wow" factor....
Personally, for the 450 to 550 dollar retail price I see better benefit from HPT or EFI Live.... but that's just my opinion.