I've got the EEZ Tire/temp T515/SP system. I just put them on and ran from NY to FL, so far, so good. the only little glitch was I also put them on my 2 trailer spares, well they need movement to keep them active, I had a few interstates that were new blacktop and if the sensor was active, then goes to "sleep" it beeps at you every cycle (mine every 30 sec) for the trip it did it about 4 times for not more than 10 minutes each, then a bump reactivated the sensor.
However, reading other posts and their inputs, I'm not sure I believe the external temp monitoring being out on the stem and in the wind. I got about 20 degrees different between the monitor and a laser temp gauge, I check the tires/hubs with when we stop for breaks/fuel.
2016 Jay Flight 28RLS
2016 Silverado LT 2500DH Diesel 4x4 with towing Package