There are pros and cons to every system so I agree that it is good to review them all and see which fits your needs and desires.

I would like to clarify though that my Air Force 1 does not need to have a hole drilled in the car floor, the short cable is a tether for the pneumatic cylinder so there is no way that the cable could ever bind and if you use the LED brake on indicator, it is powered from the car and does not have a wire running to the bus. For me the more invasive concern about this system was connecting it to the vacuum assist piping. In the end I decided that for me, this was not an overriding concern.

I chose this style system because it uses the cars vacuum assist to apply the breaks and there is no added stress on the brake pedal and support assemblies. If you have ever tried to stop your car without the engine running you know how hard you need to push on the brake pedal. Secondly it did not require using the cars battery to operate the system.

If you are worried about warranties, I suspect that a dealer that behaves in this manner will find a way to blame any system you have installed.

Make a list of pros and cons for each system that are important to you and you will find the right system. Looking forward to hearing what you decide! Have an awesome weekend.