The reason it is difficult to use is that the cartridge is a bit small so I have trouble finding the right gasket on the tire valve which causes air leakage. The sensor label is difficult to read even in poorly lit areas. But the good news is that it is very stable and accurate, it fits my AccuTire digital gauges snugly as opposed to my AccuGage gauges which are always 0.5-1psi lower than AccuTire. The only real problem I've had with this automatic gauge is that it's slowly venting like there's an internal leak somewhere. When I pull the trigger the air comes out as intended, but if I leave the air in after reading it slowly bleeds out at a rate of a few tenths of a psi per second.