I have the TST monitoring system on our TT. I haven't had any negative issues as some have stated. TST makes a Flow Thru sensor and a non-flow thru. The flow through allows you to service the tire through it while the non doesn't. The Flow Thru is heavier and should be used only on metal valve stems and the non Flow Thru are for rubber stems.
Our last trip from DE-RI-ME-NH-CT-DE pegged out at 1400 miles and no sign of the rubber valve stem flopping around, hitting the wheel. Instructions say to set low press alarm to 10% below and high pressure to 20 - 25 % above. Default high temp setting is 158 and TST suggest to leave it there. You can always change setting to the specs of the brand tires you have, but for the most part these setting are reliable.