Got the Blackburn Piston floor pump because it has a large pressure gauge located at the top of the pump. Tried it on several bike after tightening all screwable junctions. The unit leaks air. The bleed valve is finicky and requires too much effort to work. The head unit's locking lever takes too much effort to lock and unlock and is rather rough on the underside which makes it uncomfortable to use. The pump's internals do not operate smoothly. The overall quality is poor although the cosmetic appearance of pump is acceptable. This pump does not come close to the quality of my other pump (Bontrager TurboPistonHP) and costs more money.