I have never had an issue with it. In full tuck, it was a bit of an adjustment at first as it would hit the gas tank, but I was able to scoot my butt back more and it doesn't affect me anymore. I tried the EVS foam brace first and hated it, couldn't turn my head, etc, but the Leatt brace I've never had an issue with. There's even a newer version of mine that's geared more to the riding that we do that is supposed to be even less invasive, but like I said, I've never had an issue and I can almost guarantee it saved me from a broken collar bone in that same low side I mentioned earlier. If you're ever at a ridesmart day in houston (except the one in october) or CotA, you can feel free to borrow it for a session. They're about $500, so I can understand wanting to try it out before you buy it.
not sure if these links will work for you, one is a better shot of the device itself, the other is just showing i dont have any issues turning my head at lean. I literally forget its on.
https://scontent.fftw1-1.fna.fbcdn.n...38&oe=5C281305
https://scontent.fftw1-1.fna.fbcdn.n...9f&oe=5C347DDB