Pros : Doesn't leak. Provides a steady water steam.
Cons : Hard to fit included hose over the output nozzle. Documentation is .. stark.
Other Thoughts : If you're having trouble getting the included tube onto the nozzle (and you will), heat a cup of water and stick the rubber tube into it for a minute to soften it. It will still be a struggle, but that's how I mentioned to get the tube on.
The tube supplied with the pump falls out of the water intake on the Crystallite lap grinder when dry. It seems to stick better when wet. A small brass tube comes with the pump kit that may be an adapter for the water intake, but it's never mentioned in the instruction manual, so its purpose is unclear.