Read on ADVRider thumpers thread for G650GS's , also Sertao there & do a search on that topic as there are lots of posts from riders that have tried a bunch of the many choices. I'm short so only one e.g. but just rode yesterday a 100k+ miles & tried out the taller GS Sertao w/s I got with a Sargent seat deal. That low seat is a KEEPER! I don't think it's(taller w/s) a lot better than the stock tiny one for me. I may also try the stock w/s with the brkt & sell the tall if results are ???
I also have the Toura Tech adj brkt (same deal) which I'll try out next. I have two of the regular 2009-2013+ G650GS w/s's as got one of those in seat deal too. Madstadt brkt is another option as are winglets.Many swear by the wingies. Ztecnik is another route some say is there end solution as is Givi & Calsci-so many options it's best to find someone else that's sifted through the choices before you spend a dime all with a look toward the overall height more specifically the torso height of the person talking vs w/s height,angle,width & shape. F650 site has info too. I see people complaining about no ventilation into helmet in w/s threads & such , which indicates a helmet issue & unrelated to w/s choice! IIMO some have weak necks &/or don't ride enough, whatever I don't know but seem sensitive to riding in the wind which has it's effects on vehicles as hvy as a full size pickup! To put this MC wind thing in perspective some older types from windy places like my native KS will remember driving non-power steering cars & trucks in the wind & how they were a hand full at times-let alone riding a MC in the wind.
It is part of the environment that cannot be totally escaped.
"If I had my life to live over, I'd dare to make more mistakes next time...I'd relax,I'd limber up... I would take fewer things seriously...take more chances... take more trips...climb more mountains...swim more rivers...eat more ice cream." Jorge Luis Borges at age 85.