I had a friend call me when he saw these. Pretty neat idea but my comment was, it might be worth 2 mph at the most. I cannot believe 7mph.
Van's claims a 2mph difference between the 7 and 7A. That means you are going 2 mph faster if remove the whole front gear.
I agree with previous posters that I would have to see some data on this especially after seeing the price. It is also one more thing that I just don't need to go wrong, leak, or forget. If I had to place bets, I would say max 2mph increase but most likely 1 mph. Now the WOW factor sitting at an airshow is a 10! You have to love ingenuity of this market though. Still a neat idea but the cost/benefit ratio just isn't there for the weight and complexity.
What that product needs is curb feelers but have them point down. Then on landing they can open themselves up and you don't have to even thing about it.