I kind of want some for my 80 series, the factory hand brake is terrible (linkages rust and it tends to drag on the rhs wearing prematurely). The sealed design is awesome. The only drawback I can see is the separate high pressure pump and control package seems like a pretty high complexity tax. And I bet they're not cheap.

EDIT: Another question I wasn't able to figure out from their brochure is how they integrate with the factory front disc brakes.. Like, is there some kind of balance control?