Put mine on last night before the THANKFULLY last day of heat for the year, so I could get an opportunity to test them in the high 90's, and the 25 degree! cooler temperatures tomorrow. My initial impression is that they absolutely do what they advertise. With the vents fully forward (closed), my legs felt cooler as the radiator heat was being blown to the sides. My heavens could I have used these for the past few months in sweltering SC. When I opened them to the middle (straight back) position, it felt as if they weren't on at all. I couldn't really tell any discernible difference from before they were installed. I suspect this means that when cooler temperatures arrive, I will be able to appreciate the heat when I want it. I tried running with them in the fully rearward (think suicide door) position, thinking that it might help direct more air in. At least IMHO, I don't think it really made much difference. But the heat index was still over 100 today, so it might not be the best indicator.
As for styling, I really do think Kuryakyn has knocked it out of the park on this one. I'm not sure there's a lot of improvement to be made here.
Build quality, although pretty good overall, did have a couple nitpicks. They molded the parts on the parts tree in such a way that when they are removed, it leaves a small, but still quite noticeable white dimple on the otherwise flawless plastic, RIGHT where you can see it. Why they didn't do this on the UNDERSIDE is a mystery to me. I'm sure a little fine grit sandpaper and a quick dab of gloss black will tidy that up enough to keep it from a being a distraction on an otherwise great looking part.
NOW, let's talk about that double-sided tape. I originally thought it was going to be regular double-sided foam tape. Imagine my surprise when I discovered that it was actually the much stronger VHB tape. This stuff is known to be stronger than rivets, and I use it on a bunch of projects around the house. It's tough stuff, but it WILL loosen up if you apply the right amount of heat and can get something wedged in there. I just wouldn't try it in really cold temperatures, or you WILL damage the parts you're trying to separate. In fact, this stuff should be both applied and removed under higher heat. When I initially mated the left deflector to the cowl, the included tape just couldn't quite mate to the painted under portion. It could *reach* if you tried to push it on, but it wouldn't stick. So I ended up removing the deflector (which it did so just fine), and applied a second trip of VHB to this short section, and reinstalled. It's now affixed VERY firmly, and ain't going nowhere. In fact, I went ahead and did this to the other side as well. Granted the adhesive hadn't quite achieved it's maximum bond (that can take 12- 24 hours), but I stand by my belief that they're not difficult to remove.
I did encounter another negative that is not so much a negative of the product, but rather a negative of my particular situation. I use Goldstrike highway boards, and the deflectors stick out enough in the closed position that I can't comfortably rest my legs on the boards any longer. This might be fixable by relocating them slightly rearward or downward, but I haven't tried that yet. Just food for thought if you are considering them. I have a 34" inseam for reference, and my boards are mounted in the most forward position, with the arm pointing straight up.
edit: Went out for a ride this morning, with temperatures in the low 60s. This is nearly 35 degrees cooler than my ride home yesterday afternoon. With the vents closed, my legs felt rather chilly, but as soon as I opened them up, I could immediately feel the warm air off the radiators. So these are absolute winners in my book.
