I have it also, have had it on several bikes in the past. It does increase the envelope behind the windshield. It is kind of expensive but it can be transfered from bike to bike.
I tried the micro edging on my VFR givi touring windshield and it made it noisier, as for the Lip, I have one on my stock FJR windshield and I love it, its very quiet in the up position with less buffeting, I would buy the Lip for sure.
If you want to try it, but can't afford it, there's an inexpensive alternative. Go to your local auto-parts store and buy a length of 1/4 inch hose. Air hose or fuel hose will work fine. Cut a slit in the hose along the length. Slip it over your windshield. Voila. Good for rat-bike points so may not be appropriate for FJRs.