I just received this unit. I've only used it once but wanted to give a review due to lack of material for this list. I had to add about 12 pounds of air to each of my tires. The device is well made and very easy to use. Also, the power cord is longer than other devices, which greatly simplifies connection to the bus. The device is simply attached to the tire. although there was NO QUICK RELEASE on the end of the air supply cable. You need to screw the connector to the tire air valve. The device is easy to program and fills the tire quickly. In this case, about 12 pounds of air was pumped in about 1-2 minutes. It's faster than other units I've seen. Note that this is a COMPRESSOR and is very noisy, although probably not as noisy as the commercial pumps at neighboring gas stations.