We have one and it has real problems. It did notify me of a low pressure in one tire when we got in the vehicle in the morning. It did not warn us before a blow out. It cycles thru each tire, one by one taking over a minute to go thru them all.
If you feel OK with taking your eyes off the road for that long then you might like that TST model. I spoke to their rep at the Tampa RV show and the new models still work the same. There are models that show all the tires continuously and that is what you need IMO. The rep claimed that the tire pressure is trapped in the sensor when a blow out occurs and that's why it failed to warn us. But right now I would not buy a TST.
Hopefully someone out there has had better experience with other brands.