Roadmaster Invisibrake?

I am now on my 2nd toad using an Invisibrake system. I have not had any problems in 43K miles, although I have not yet towed my second toad. I kept a couple of the component of my first toad and had them installed on my second toad. The cost of putting the Invisibrake on the 2nd toad was $2K. As far as disadvantages go, it is more costly if you switch toads frequently. With both my toads, the invisibrake system itself was placed under a front seat. I always worry about a rear seat passenger hit the dial with his/her foot and moving the settings. Other than that, it is a slick system, and better yet, their hdq is about 10 miles from my house.