Eric, I've had mine on for a couple days now, but I haven't done my typical morning drive so I'm not SURE if they're helping yet (temps in the 40's) but I think they are.
I too had a slight fitment problem with the lower right piece.
I also bought stainless hardware due to our rust factor here, would you consider adding stainless as an option on your kits? Just a thought, I'm real happy with them.