I had done this way back in 2005 on my SRT-4, before this was a product really. I just went to Home Depot and bought some garage door weather stripping, which is exactly what this stuff is. Now I sort of laugh because it was a bit ricey in hindsight.
But the question I always wondered was whether or not this rubber stuff flaps or bends while you're at speed. I've yet to have the chance to observe another car with this stuff on the move.