Bought mine last year, use it when I need it, works great. I had to replace the 1st one though. One day I used it so much I ran out of air halfway home. I stopped to fill it with my Co2 cartridges. That was not a good idea. Because of the amount of pressure that comes out of the Co2 & the very small diameter of the fill tube for the Airzound which could not handle that much pressure at one time it literally blew the valve apart to where I could not fix it. So I had to purchase a 2nd one.
I now use a mini-pump to fill it if I run out while riding & use the Co2 to only fill the tires.