I put a Slipstreamer S-08 on the '77 550 - taller and wider than the one on the link. I like it - takes the wind off my chest.
Obviously adds safety from bugs, gravels, etc. (no more bugs on my face shield). I got it @ $100 del.
At first installation, if you have some buffeting, you can raise the windshield and/or alter the angle. Experiment until you get it to "fit you". I'm 5'-10" and found I needed it high as it will go (although an angle change would likely accomodate taller folks).
It is a "quick release" but personally, I see no reason to take it off.