This pump looks and feels great , however, as already stated by others in reviews , the connector is very tempremental.
I bought this for my new bike which has a Presta Valve and it works well enough, although it can be fiddly to attach with a good seal. When I used on a schrader valve for another of my bikes it deflated both teh back and front tyre and I had to resort to a car pump to reinflate. I have since sold the bike with schrader valve so no longer a concered.
For the money and amount I use pump it's been worth it but if you are considering a new pump it could well be worth looking at others with a more reliable connector and stronger reviews in that area.