M&G is a well designed and mfg product. However one does not fit all. Recently changed towed from Ford Sport Trc to 2011 Edge. Though they do offer a modest allowance if the unit is returned there is still a sizable purchace price. They did not have an installable unit when I checked. Went with BrakeMaster, air operated pedal mounted system. I have had the other brake pedal mounted systems and found them nothing but trouble. BrakeMaster was a little involved to install but not as involved as M&G. As a plus I should not have to get a new unit when I replace my towed. Had some doubts about another pedal mounted system but so far it has worked well.
As side note Edge Limited has no means to turn accessory power of when car is placed in N. Needs aux charge ckt from coach.