These tools do indeed do a good job, but I feel that a warning is in order.
Please, when using this tool, do NOT EVER think of using any fluid with a low flash point. When the fluid comes out of the nozzle, it is atomized and ready for ignition.
You would not believe how many mechanics I've seen over the years using this tool with the suction tube thrown into the aircraft fuel tank. A disaster just asking to happen.
PLEASE,PLEASE be careful out there!