i had a small acerbis screen on my 1VJ until it fell off the bike through repeated falls/cracks/etc, but while it lasted it was great! it wasn't very big - certainly no higher than 30cm, but it did a good job of channelling the air flow over my head and made cruising in an upright position much more comfortable.
i never actually looked through the screen, so it didn't need to be clear (though mine was), but the one feature that made the most difference was a little "lip" along the top which helped "scoop" the wind over my head and away from my torso.
a very useful little addition to your bike if you are going to be on it for long stretches, it really does take a lot of the wind resistance off your upper body.
good luck!
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