Yes... a bit hard on the hands at first, but you get used to it. I feel like the throttle could be a bit tighter. I tend to prefer a tight throttle feel.
The metal part of the grips takes a little getting used to. I love the set-up, but if I raced, I'd probably go with something softer. I have huge hands so I prefer a fatter grip than this. It does feel quite nice now that I'm used to it. Stiffness... not realy an issue for me.
I did a lot of adjustment until I found just the right location for the clip-ons, but that's the point, right?
All in all, setting aside any minor compromises, it looks amazing and it feels good (but not great). I had some vibration with the stock clip-ons that I no longer have. The vibration was annoying as shit, so I was glad to see it went away.
In other words I'm pleased with the result.