Well built. Its size is small enough to keep it supervised all the time and the airflow is enough not to drive you crazy when using it. The maximum running time is 30 minutes. CFM (17.5 l/min) is too much for a compressor that plugs into the cigarette lighter socket. Most compressors that only have alligator clips produce more CFM. The automatic stop of the high-pressure pump is good. I don't know the CFM for the low side, but it will inflate a double airbed in a minute or two.