Bests & Worsts Reviews from Amazon

Ok, I am struggling between 4 and 5 stars on this pump. It frustrated me to no end when it first arrived because I could not get the valve chuck to stay on the bicycle tube's valve, both Presta & Shrader types. It wasn't until cursing many, many, many times that I figured out that the valve chuck "locking lever" is OPPOSITE to every other type of air chuck I have used... EVER! The picture I have attached is showing the valve chuck in the LOCKED position. There were no instructions that came with the pump that I noticed, if there were, well they got lost somewhere I guess. But once you figure out the valve chuck the pump works great. I can easily pump my road bicycle tires up to 100 psi without issue.