Anyone using a Maxbrake brake controller?

[belfert]

Anyone here using a Maxbrake trailer brake controller?  It does proportional braking by sensing how much air pressure is going to the vehicle's air brakes.

I used a Brakesmart in my F-350 that worked basically the same except it measured hydraulic pressure.  I would use Brakesmart again as they have an air model, but it is unclear if they are being manufactured at all.  The company that was selling them sold the product to another guy who I can't get in touch with.  This is the 3rd or 4th owner for Brakesmart.

Anything to be concerned with having to put a pressure sensor into the air system?