I'm usually in no big hurry when airing-up, but if i'm B.S.ing and not paying attention this thing will overfill rather quickly.  I had a smaller one similar to yours and it gave me a lot more time to B.S. a bit before we got back on the road.  I always use my Accurate Bourdon Tube type gauge to check the final pressure, never rely on the pumps gauge.     How do you like your Budbilt traction bar?