BrauKon has become quite popular here in CO.
Left Hand started it off with buying one of their kettles.
Then Bristol Brewing ordered a 40 hl system for their expansion.
Doug Odell has a 105 bbl 4-vessel system on order. They have used a BrauKon hop back system for many years.
My old brewery, Rockyard, has placed an order for a 30 hl brewhouse.
I consult with Backpocket Brewing in IA that has a 40 hl BrauKon system that they love.
Troegs, Flying Fish, Sly Fox, and St. Arnolds all use BrauKon. Most of these are steam powered, however.