The website is terrible – It was originally a crowd funded project years ago and a guy in the us bought the company/rights from the original creators/designers. He now runs it on his own I think. So it had lots of bad press and the crowd fund was ride with delays. And the website looks like it’s from 2005.
I actually have two sets, both bought from eBay I think, been using it for around 3yrs with no issues, shifting is good etc. Just works like any other system. My main gripe though is that you can’t leave the battery on the main unit without it going flat over the course of a couple of days. So they need constant charging and you need to prep to go for a ride (or stick it on charge for an hour or so). The batterys have also degraded a little over the last three years (I think they use cheap batteries) so the charge on lasts half as long as when new.
But the actual shift and on use is great 😁, I had it originally on my bamboo bike.