Thanks to the flexible hose at the front end, the pumping movement is not transmitted directly to the ball, that there is no canting between valve needle and ball and the valve pins no longer break off.
Due to the two-way technology the pumping capacity of this pump is truly impressive. For a "lax" has become ball usually be enough 2-3 pumps of, so that it is taut again.
Conclusion: After several years to pump still with the first valve needle is already a strong performance. Definitely recommended!