I have the original Vetter Winjammer (and lowers!) on mine, have since new in 1971. It's the older, hand-laid fiberglass version (yours is ABS, more flexible). I have ridden back-to-back-to-back 1000 mile days with it, then got off at the end of the day and enjoyed places like Carlsbad Caverns or Mount Rushmore or such. The difference in fatigue is simply amazing. I've ridden through summer thunderstorms with only wet toes, through sandstorms that removed the paint from the bike's sidecovers and sandblasted the windshield to where I had to get another (my brother was on his 500 then, his, too!), and crossed and re-crossed the American West behind this fairing. It makes me far more visible in traffic and stops an awful lot of stuff tossed at me by cars and construction trucks on the road.
That's just the short story! I won't ride any significant distance without it, now.
When you install it, be sure to add some 1/2" long spacers into the fork tubes up front: your worn springs will sag the front down with the extra 18 lbs. Resist the urge to load the front pockets: they are just too handy!
One trip to Black Hills with my wife found 440 lbs on the front wheel and 680 lbs on the rear: by moving some items into the fairing I was able to rebalance the load to 600 on the rear and it stopped the over-heavy rear load wobble that can happen in heavy 2-up touring. I added air forks early on with this fairing by installing Schraeder valves into the fork caps: I run about 5 PSI with no load and up to 12 PSI fully loaded and 2-up.
Craig developed the Windjammer on his own CB750!