I had a Michelin inflator previously that was hopeless. The connector for the valve was a "clip on" attachment with a lever to depress the valve centre. It was difficult to work and eventualy gave up altogether! The first review I read of these mentioned similar experiences. THIS inflator has a screw on connector. Not as quick BUT IT WORKS!
The unit comes in a smart zipped nylon carry case with a pocket for the instructions and it's small so can be placed in side pockets in your boot (if you have them). It's easy to use and reasonably quick for a small unit. I was so impressed with the first one I bought, I got a second for my daughter's car. It has three readings settings PSI, BAR, KPa and automatically over inflates slightly to compensate for any loss removing the connector. The 12volt connector is adequate for most family cars and the pressure hose is a good length with fabric covering. Both cable and hose stow neatly within the unit and the torch feature (with usual flash facility) is excellent.
Why ony 4 stars? Well the Michelin Unit that I had previously "looked the part" but as it turned out failed completely fairly quickly. This looks a better build and is definitely a better design but, like insurance, I haven't had to use them much since I had them. It may not keep you fit like a foot pump ....but when it's dark and pouring with rain the torch and automatic inflation feture will beat the aerobics!
With Air pumps at Service stations being either coin operated or out of order this will always be a worthwhile investment. Used regularly for minor top ups these shpuld last for ages.