I have a VA unit and am fine with it. I have no idea where the other folks live but in New Jersey, with a COUPE during the AC driving season, I AIN'T mixing NO hot air with the AC. The heat gain with the coupe's rear glass makes it an "on" proposition for me - it only goes "off" when I'm back in the barn. I do not miss a "mix" feature.
The only problem with the VA unit is the crummy micro switches they provide. I bypassed them with a 3-way switch.
As I remember, I also wanted to go with a company that would be in business for years to come and VA, at taht time, fit the bill. I really don't think that's a deciding factor anymore because I know realize that the important stuff is off the shelf OEM and available anywhere.