Which tpms to buy?

I too am satisfied with my TST 507RV. However I did need to install a repeater in my trailer. My unit is long, 38+ trailer and long bed crew cab truck. It would read the sensors setting still and after about an hour or two on the road it would start loosing the back axle sensors. It works fine now. I have the flow through sensors; I can add air without removing them. Batteries are user replaceable.

There are about a half dozen different manufacturers and users seem to be pleased with all of them. Agree with user replaceable batteries.
I have a TST 507RV and am happy with it.
Lots of reading here.

I would just suggest that whatever model you go with, make sure the batteries in the sensors are user replaceable.