I just put the GIVI windscreen on my 650twin.
Now I'm able to ride at highway speed with my visor up. No buffetting, little noise, great wind protection. I do have the lowered version, and am quite small (5'4"), so I am pretty much right out of the wind. DH is 6'4" and experienced a little buffetting on the top of his helmet when trying this set-up, but nothing annoying. This screen seems to do the job pretty well.
Vario sidecases are here and going on this week. I like the Jesse bags, but I don't want the weight. Most of my off-road riding involves short day trips, so heavier duty cases aren't really justsified. I also purchased a small pelican case as a top-case and will mount it after mounting the side-cases. (I miss the small trunk on old 650. It was handy for carrying a wallet.)
Next up, SW Motech crashbars and bashplate. Still looking for handguards I like.
What accessories do you have? Any comments on how well they work for you?