I'm only 5'4" and use the National Cycle Street Shield EX. Once you fit the handlebar and fork clamps it comes on and off in a couple of minutes.
The shield reduces wind noise to almost nothing, which is the main reason I got it for my last bike (universal fitting) as I don't like earplugs and hate wind noise. For a taller person it'd still work OK I reckon, and messing with the tilt would probably give you a similar result to me.
It's not the prettiest windscreen in the world, but it looks OK to me and it's very practical. It also costs a LOT less than the official Triumph stuff.
EDIT: if you fit one of these, be careful to note the length of the stanchions that fit to the forks. As it's a universal fit, these are pretty long and I had to hacksaw mine down a little to avoid the extra length projecting too far back and scraping the side pods on my Virago. Dunno if I'd have had any issues with the originals on the Bonnie as the cut down stanchions are short enough not to be a problem.
[ This message was edited by: steviek on 2006-11-29 10:21 ]