Bought the Tire Tracker TT400 system back in September from a vendor at our Region 5 rally. Have used it on two trips so far and has worked fine. I did not buy the signal booster.
I find it interesting how the tire pressure and temperature change with the heat of the sun or cooling effect of the rain. The initial programming was a little quirky but once I understood the process it was easy.
Steve, Christy, Anna and Scout (Border Collie)
1994 30'11" Excella - rear twin
2009 Dodge 2500, 6 Speed Auto, CTD, Quad Cab, Short Bed
Hensley with adjustable stinger
WBCCI # 3072
AIR # 6035