2 stars for the 2 times the supercharger ran to fill up my tires after a few off road rides. On my third trip I was able to inflate 3 out of 4 tires but then the compressor stopped working and went in the bin. Also, the PSI was off at about 5 PSI, prompting me to vent to avoid overflowing. The most expensive air is $80 for 11 tires. Over $7 for an inflated tire