Still wanted to ride a Gixer but being 58 came back with wrist and back ache after rides, saw this product took a chance and ordered it as there were no reviews.
I looked at Helibars but they don't have any near as much adjustment.
There not cheap, but being German the quality is great and the amount of adjustment is awesome. Fitting is pretty easy even for a lay man like me and there are a couple of videos on Youtube which helps.
You don't need to change brake lines etc but I had trouble getting the brake lever into the position I wanted it at and for some reason the GSXR comes with a locator on the brake banjo bolt. The only way I could see to move the banjo into a position to gives me enough clearance, was to dremel the locator off and that worked.

Also I found to get the bars in exactly the right position for me, I went out on a couple of hours ride with an allen key and kept adjusting bars and trying again.
Really pleased with the results and now would even consider doing a trip on this bike, something I would not of done before fitting this kit.