I had one. I really liked it when it was working. But i had an issue once where the freehub locked open and completely disengaged. it was freezing cold though so maybe the grease was extra thick and sticky?
I took it all apart and tried servicing with the correct grease etc but the freehub then always feel quite sticky and dragged with the wheel. I guess i was doing something wrong but couldn’t work it out even following the various guides online, so rebuilt the wheel onto a 104t Bontrager hub i had lying around.
I think they may have changed some bits in the newer models as i’ve since seen them and they are much louder and don’t go silent like mine did.
I really wanted to ride it, and when it was working was great. its still in the shed to try again another day, its just overly complicated when there are much simpler hubs out there i dont have to worry about.