I saw that and thought it looked cool but wondered at the reliability of the rear brakes using that. That reservoir looks like it isn't even half the size of the OEM reservoir.
I used something similar on the rear master for my motard... the rear brake lost all pressure in about 3 days..I don't know where it went
...boiled away maybe? I would not run this on anything but a show bike...
I have to admit mine wasn't as cool looking as this is though