I put the Masterflow 12v High Volume Air Compressor/Inflator to the test, and it passed with flying colors. I released all the air out of my truck tire on a scortchering 100 degree, miserable hot summer day. I did this because I did not want to stay out there longer than five minutes. I timed how long it would take to fill up my tire and it did it in under three minutes(with the engine on of course). It was very quiet, no vibration and performed very, very well. Had it not done this in less than five minutes, I would have returned it. I'm happy to say that in the event of an emergency or if I leave to work one morning and find that I have a flat tire(like it has happened before), I can depend on this product to bail me out of a difficult situation fast, instead of putting on the spare tire and being late to work. The only thing that I didn't like is that the guage does not read accuratley, but then again I always have an air guage in my truck to check my tire pressure. The important thing is that it does what it says it can do and that is worth buying.