Media failed to load. I hate when I turn on my car's engine in winter mornings and see a tire pressure warning in my car, especially in cold weather when the tire is deflating at low temperatures. I used to drive a mile only to then spend $1 to use my air compressor to put air in my car's tires, but at over $1 a trip driving a mile is just a chore and definitely a waste of time. I have 3 cars at home and recently bought 2 portable tire inflation pumps. I bought this for my wife's luxury car because it was unlike the other two I own and having used it a few times I can definitely say this is the best of my three portable tire inflators. WHAT I LIKE: [+] All the metal parts in the bus coupler! My other 2 tire inflators have a plastic part. [+] Works with a cigarette lighter adapter AND has an outlet so you can use it at home to inflate other things [+] LCD screen with digital adjustment and it will automatically stop when it reaches the listed PSI so you don't have it worrying about inflating tires[+] There is a grommet on the back of the unit for cleaning items when not in use[+] Comes with a variety of adapter tips for balls, bikes and inflatable boats[+] Has a built in LED flashlight in case you need to use it at night or in the dark[+] Comes with a storage pouch which was a nice surprise. I keep it in my wife's suitcase. [+] Inflates much faster than the other 2 tire pumps I have. I sincerely think it's less than 0.5 since every time you plug and unplug the bus some air will leak out. You can simply adjust accordingly to compensate for the 0.5 offset. [-] I wish the LCD was a bit easier to read during the day, but that's not a deal breaker [-] It would be better if the storage bag had a separate pocket for cables on the outside, but there's plenty of room on the inside for the cable pocket, so too no problem. It would just be easier to manage and organize. CONCLUSION: Easily 5 out of 5 stars. I highly recommend this portable tire inflator. Very fast and durable stuff all round, not to mention the extra outlet which I haven't seen on any other tire pump.