I have TireGard, I find it works great, I'd say +- .5 lb. The sensors are valve stem caps, can be moved bike to bike in minutes. long battery life, displays pressure and/or temp, you can set high and low warnings if desired, auto shut off. just press a button before you mount to check pressure, you may have to roll bike a few feet to reset from last ride, but I have seen it reset by just waiting 15-30 seconds. Watch pressure rise as tires warm up, so far in about 70 deg riding the pressure rises 4-5 lbs. One of the best investments I've made for my Wing @ about $160.