I got rid of the Primus frame pump that came with my bike when it was new because I hated loosing air when disconnecting the hose on Schrader valves. The quick connect head of the Zefal made things much simpler. Now my bikes have Presta valves, but I still don't see the need to screw a hose on when the cam lock fitting is simpler. Toe-MAY-toe, toe-MAH-toe. YMMV, results not typical, and other such caveats...