It is quite easy to use as it gets turned on. When I left the English conversion adapter on, the air did not enter the French valve. The rubber of the mouthpiece spread too much, the air leaked and leave it for a day, so I managed to use it somehow. I think that it is a problem of usage, can not you get a better adapter?
Although it is a comparatively expensive air inflator, I think that ease of use is as good as it is. Because high pressure can be put with so much force, it is recommended for those who need high air pressure. It might be good for high pressure tires, especially racers. However, the usability of the clever valve of the head part may not be so good. If so, is it OK? Is it?
I bought it for bicycle pneumatic pressure management. However, in English bulbs the air gauge is not working, it is written in the instruction manual. Such a thing was not written in the catalog, so it is very disappointing.