I have the Ox Brake on my current bike - '07 KTM 300. After several local rides, two races, and a 4-day weekend at Hatfield & McCoy I must say it's a keeper.
When my '17 300rr arrives in August one of my first mods will be Rekluse and besides the obvious reasons for the Rekluse one factor is being able to use a LHRB. I read a lot of how folks use the Ox-Brake on steep downhills and in circumstances where the rear brake pedal is hard to get to or use, and it's all of that, but frankly I've learned to use it all of the time. I'm able to maintain my preferred foot position on the pegs (balls of feet) much more often and I can take right hand turns a little more aggressively.
It does take a little time to get the adjustment down if you want to be able get the rear wheel to lock up. You want no more than 5/8" travel on your rear brake peda, at least on the KTM, l but at the same time you need to maintain a smidge of freeplay (or you end up with locked up brakes, don't ask me how I know that!). So keeping the brakes adjusted properly is important to get the full use of this thing. Additionally, I don't have Superman's grip so for me it's a two-finger operation but you get used to it with practice.
A great add-on!