Do not get me wrong the TST 507 is a good system. Are there better ones I believe there is.
As long as you understand the limitations of your system and use a repeater or remote antenna when needed and make sure you are getting valid and timely reports from the sensors you should be OK.
I have noticed on this forum there are four things it is best not report anything bad about them.
Ram diesel trucks
TST TPMS systems
B&W trailer hitches.
MaxBrake brake controllers
These items have some very loyal followers that believe there is nothing in the market as good as these systems and some will go so far as to declare what you have as junk.