More than a year later this pump is working fine, The dual pressure mode makes it a snap. For those that find it tedious to hold a pump on a presta stem and inflate a tire look for a pump with a hose connecter - myself included these days.The rubber seal on the pump head sheds a slight bit on the valve threads but should last a couple more years before replacement is needed. A very good light pump for your seat bag.
Used this tool for over a year gave it chance to prove itself. Operating the chain tool with wrench on the separate tire tool was not a good experience. Not well thought out in my opinion Crank Bros does it better and so does Blackburn. The plastic portion of the tire tool eventually broke and my tires are not that tight on the rim. An 8-10 mm wrench instead of a tire tool would be good. One should use separate tire tools anyway. The pop-on 8mm Allen wrench is ridiculous. Expected a mature product from Park this one is a failing sophomore effort.
Small version which takes a little more time to operate fits into a 1 liter seat bag suitable for rides (shrader valves) with the grand kids. The medium version is frame mounted for commuting and adult rides. Both do their job very well. Holding and operating a pump on a presta stem has its drawbacks. The connection hose has answered the need for these old hands. Works great every time and the pressure relief for presta valves is an added bonus. Well designed product for the price and if you can find a sale all the better.
I was expecting this pump to perform with a Schrader valve but to my surprise it did not. Maybe the sample I received was defective. I am glad I found out now rather than while out riding with my kids and when one or both of them have a puncture. I have a Blackburn air stick for my road bike that works great. It appears to be well made and I like the appearance, maybe I will order another one later, but for now I will go with different brand.