Have had good luck with the TT extension. I have the stock shield, stock seat height, I'm 5'7" & have used it on long and short drives. It gives just enough additional protection from cold, heat, & high winds for my tastes. Easy to remove and store when I don't want to use it. Only odd thing is that it really seems to add a lot of movement to the wind screen, really starts to move around in high winds, I guess from the extra weight added to the top of the screen. But for the money it works for me. There are a couple of aftermarket screens I might try if I get some extra cash. .