I've done a fair amount of analysis since I just upgraded my tpms. Here's my opinion.
Tire Sentry is a good system, but is what I would call a passive system. It's pressure sensor is a mechanical device adjustable by the user that sends a signal to the monitor when pressure drops below a preselected value. It does not provide a reading on the monitor for tire pressure or tire temp. It does use replaceable batteries in the tire sensors. I used a Tire Sentry for years with very few problems, and these were corrected by cleaning the battery contacts, etc. Over a 5 year period, I had to replace 2 sensor transmitters, and the company support was excellent.
Tire Tracker/Tire Minder and other labels of the same system provide tire pressure & temp on the monitor. I've never used this system. Most customers report good results. If you search for the various vendors for this system, notice that the warranty varies from one to multiple years depending upon vendor.
The TST507 provides tire pressure & temp on the monitor. I've just purchased this system and so far I like it. It has replaceable batteries in the tire sensors. I think their 510 system has tire sensors that must be returned to the vendor for battery replacement. I've never used a 510 system.
There are some other systems that seem to be from the same manufacturer as the TST systems that I've seen some posts of happy customers, but I have no experience with these either. One such system is that sold by EEZ RV PRODUCTS. I have no experience with this system either.
I hope this info helps.
Fred
Fred & Vicki
St. Augustine, Florida