Just had a look at their kickstarter page. People have received them.
Lots of anectodal evidence saying they “feel” more power. Most people are reporting a reduction in noise.
“
I have to say that it works for the noise of the engine but I had not any improvement in fuel consumption ! My Prius hybrid has been always near 4.2 liter for 100km and it stayed before and after the usage, no difference even after 4000km after using the tribotex”
There is also a spritmonitor link:
https://www.spritmonitor.de/en/detai...27.html?page=4
(May not be the same guy, but apparently Prii drivers keep better track of their FE.