I have the sunpro tpms monitors. I got them for a good deal, so I didn't really do any research. They are great.
My only worry is that one day I kept the readout plugged into the truck and the tire pressure and temperature stayed on like it was still reading, even when I got to work 7 miles away. How will I know if one of the monitors stops working? I guess I am supposed to notice that the normal variation as you drive just stops and it gets stick on the same reading.