I bought a GT-air based on quite a few positive reviews. I don't get to use it until next week, good to hear it gets another good rap.

I have an 08 flht, the buffeting over 80km/h was terrible when I first got it.  I fitted the air dam that lives under the bottom triple clamp, big improvement. I then fitted the air deflectors that sit on the sides of the fork legs, huge improvement. 50,000 kms later I still won't take 'em off !!!! I had them powder coated black to help them blend in and disappear, it worked. I just did a 12 hr ride from Sydney to mil dura and rode with the visor on my full face open the entire way, not even a rattle from it. It's that effective that I've had to buy a 4" screen for summer as I just melt with the standard height screen on. Can't recommend the fork leg and triple tree combination enough. Also, this doesn't change with any brand of helmet. Hope this helps someone.

Wife and I are up for new helmets so will go look at the Shoei GT-Air, thanks for the tip. I must say I'm not having any dramas yet with my 2014 Road King classic but then I haven't done more than several 1 hour trips yet either.

I'm running a bell shorty helmet, stock 4 inch street glide screen on my 2007 bagger with no buffeting.

I have just ordered the CVO Road King screen and the next buy is the GT Air. I hope i have the same results as you.

I put an 8" Klockworks screen on the Ultra and run an open faced RJs helmet. As described by screen manufacturers, the screen should roughly be the height of the bottom of your nose. I haven't noticed any buffeting at all. I'll keep the full face for the sports bike.

I can't recommend the Shoei GT Air enough now. The pinlock antifog screen is a pain in the ring to install, but works a treat. The flip down tinted visor is a luxury I could never live without again, saves the cost of a good pair of sunnies, and without the pain of sunglass arms digging into your temples. No buffeting whatsoever when at speed on the freeway and doing your lifesavers to change lanes. Confidence inspiring snug fit. This is the helmet I'll measure all others by now. $900 is steep, but considering it as $180 a year over the supposed 5 year replacement period, it's well worth it. Still cops a bit of wind and exhaust noise, I was semi-deafened after 250+ kays, but as China mentioned, some earplugs would sort it right out. Great piece of kit.

On the 99 Glide Standard I was buffetted badly with the standard screen.  Replaced it with a taller one which reduced the buffetting but no good in foggy conditions, also too hot wih no air flow.  Last choice was a very short screen which allowed full wind on the face with no buffetting but still the protection of the batwing fairing.  It was was fitted with air deflectors. I was using an open face Shoei and then a Shark Evoline series 2.

Recently replaced the FLHT with an 08 FLHX which has fork air deflectors and lower fairings which are both adjustable for airflow.  The screen was a very dark tinted 8 inch Clock Works air splitter which is curved at the top.  Absolutely brilliant on the ride from Adelaide to Melbourne using the Shark Evo in open and full face modes.

For the time being I've slipped the clear standard height screen back on and I've noticed the return of he buffetting on the top of the helmet.  I'm now checking out the best price for a another wind splitter with only light tinting. The two screens are the same height but it is the new design that makes the difference. 

As for helmets,  the Evo 2 is the best and most versatile that I've used. It is comfortable, not too heavy and the chin piece when at the back of the helmet is not noticeable.  Highly recommended.  I noticed that a series 3 is now out.