Compact, relatively quiet (for an air compressor), easy to transport, adjustable pressure. My only complaint is that I bought it to inflate my bike's tires, which require 120psi. So I sold my 100psi compressor because I couldn't just add the last 20psi with a hand pump. When I first used Cobalt it would go up to 120psi and shut off. After that it only goes to 116psi and works until I turn it off. Don't expect it to pump to exactly 120psi.