That's the bad theing about the mesh. If it is done right they are great, but they can be finicky to get started. If they rattle on startup you can blow into the airline and the pump will start.
They can be a pain in the butt , but they pull alot more air. Look at the mesh, and trim off any little stragglers that are sticking out, or up. The mesh should extend about 1mm past the yellow disk, any more than that and they are too heavy for the pump motor.
It just takes a little messing with them to get used to it. Alot of peeps don't like to tinker, so they use the PW"S. But ,IMO it is worth the gain to use the mesh.