I was pleasantly surprised at how small it is yet easy to carry and store. It's not as noisy as some air compressors of the same voltage, which is nice, especially if you live in an apartment building. Switching on the motor when using it makes a big difference. It has a screw mechanism that makes the connection with the tire nipple more secure. To get more accurate psi meter readings, you need to turn it off, loosen the screw, retighten, and turn it back on. Leaving it on or just turning it on/off will not give you an accurate reading. Gave 4 stars because I don't know how long it will last. But so far the overall impression is above expectations.