I am interested. It is an elegant solution for the rear e-brake. Note
here is their blog write-up on how it works. It's elegant but I'm bummed that it is designed to be mounted to the back of their caliper instead of "in-line" which would make it universal.
I have the BMW Performance / Brembo BBK for the front. I'd love to run the same setup in the rear, with an in-line electronic line lock. I thought there might be a solution in the hot rod world ...
While the PB solution is elegant, $2k plus ship for rear brakes is a bit stiff, though not unreasonable for a complete solution.
Filippo