
I'm 5' 8". I wear custom made ear plugs with in-ear speakers.
On my bike I have tried the following:
Standard screen - ok, but noisy and buffets. Not pleasant above 70mph.
Standard screen cut down - pretty much as above.
No screen - no buffeting at all, wind noise under helmet, very strong neck muscles needed above 70mph. Ok for hooning around the mountains, but a PITA when getting there.
Givi touring screen - better protection from wind blast, but still noisy, and still buffets. Ok, but not nice over long periods.
Givi touring screen with MRA extension thingy. - as plain touring screen, but still annoying buffeting and noisy. Still not pleasant over 75 mph, and makes my tinnitus worse.
I've just bought a Palmer Products large screen and mounting kit, from Iain Palmer:
http://www.palmerproducts.co.uk/
HALLELUJAHPRAISETHELORDFUCKINGJESUSCHRISTITSAMIRACLE!

On my 160 mile journey home, all along the motorway on Saturday, I had the opportunity to try it on various settings to see if I could finally eradicate the murderous buffeting. I finally found that with teh screen at it's highest setting, but tilted back towards me as far as it would go, the buffeting is all but eradicated, although there is still some wind noise. So, that's smoothness, but a bit of noise, right up to an indicated 120mph (on private motorway type roads of course). Sitting at 80 - 85 is now a pleasure, rather than a chore. My head isn't constantly shaking around, and the noise levels are much reduced. Fanfuckingtastic! The top of the screen is no higher than on my Givi with MRA setup, but as it's angled back towards me more, and the screen has a slight curve to it, the air slips smoothly over me bonce and I'm a happy bunny.
There is one slight trade off though, the handlebar guards now foul slightly on the screen when at full lock, but only by a couple of centimetres. Not enough to be an issue, the SMT has a very tight lock anyway so I don't think it will hinder me in anyway, only noticeable in tight maneouvering.
The big bonus is that it takes the turn of 4 hand screws and about 10 seconds to adjust the screen, and I know that when I get to the mountains I can put it to its low setting, tilt it forward a bit and it won't foul and will be well out of sight line even when looking just ahead of my front wheel.
This is the second such setup I've had from Iain, the first one I have on my Buell Ulysses, but that was his first incarnation which doesn't quite have the same range of movement, and needs allen keys and spanner to do the adjusting. The new kit is all hand adjustable and has a bigger range of movement.
Iain is a great guy to deal with, extremely knowledgeable on all things bikes, and goes out of his way to ensure you're fully satisfied with his products. He's got a good range of gear, and will happily talk to you about custom and one off stuff I'm sure. The kit for my Buell, which I go from him in 2009, is still working fine and the screen has stood the test of time - it's very very good quality kit.
I'm in no way affiliated or connected to him, other than having been a satisfied customer before, and a very satisfied customer again. Have a look at his website, I'll post pictures up but probably not until I get the beast out again for my next tour in September (no time to ride unfortunately).