I have fancied one of these for a very long time. Happy Jack was selling one and I jumped. I have it set up at my weekly residency (church).
As we are all aware, bass is never allowed to be loud enough anywhere. So as to keep a quiet stage we have moved to wired in ears and the drummer and I are sitting in front of the FOH feeling the LF as best we can. To make it more fun, my ears are shot so I have to wear earplugs to play. I was just listening through those. But sitting on a chair on the bass board is a total game changer. The volume does not go up, but the physical interaction is a lot more real.
In the spirit of the BC self build cabs, I feel certain that people who are not DIY clueless could easily build their own ones. And also improve them by putting a plate amp in there. Just thinkin'......