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Review title: Pretty terrible
Product review: I purchased these to replace a pair of Zipp valve extenders I was using on a set of 404s. I found that the Zipp extenders didn't allow the pump to attach securely, so topping off the tires was always a two person job. Reviews of the Topeaks (like the ones here) suggest that pumps will attach securely. Sadly, this turns out to not be the case, and I've tried it with a number of different pumps. And the valves, once the pump is attached, will release nearly as much air as your putting in. I understand that some people have no problems with this, but if I were in the market again, I'd just buy 80mm tubes (which I have since done). I recognize that that isn't an option for people running really deep rims.
