Overall I am very happy with this product. It's conveniently small and easy to use. However, I have three minor complaints. First, the air hose that comes with the compressor is not exactly the same as shown in the description. The picture in the description shows the clip for attaching the tires, however the tube (which is detachable) is bolted on at both ends. This means that after the tire has been inflated, some of the air is lost when the tire is released. This can be remedied by purchasing an extension hose with a cap cartridge. Make sure the connector is the correct size for the hose. (One option is the "LUMITECO Lockable Tire Chuck with Rubber Tube and Fine Standard Tire Valve Threads"; however, if the tire is mostly inflated, some finger strength may be required to secure the chuck.) Perhaps a better option is the "Automotive Tire Inflation Hose". Self-locking rubber hose inflator with air hose and standard fine thread tire valve for .305"x32TPI air compressor pump (sold by Hammockit); It has a much simpler locking mechanism. Second, the device contains a built-in battery, but when the battery runs out and you need to use an inflation pump, the charging cable (USB) is not long enough to go from the car network (old cigarette lighter) to the bus. This can be fixed with a 10ft USB extension cable. Finally, I tried inflating a bike tire to 45psi; The device appears to be stuck at around 37psi.