Things I liked:Fills the tank. Cheaper than better models. Things I would have changed:As others have mentioned, air leaks through vent valve. What others should know:Other styles will probably work better.
Things I liked:Cheaper than the brands that actually work. Things I would have changed:Very poor design, assembly and quality control. Not only was the pressure release valve faulty as others have noted, the gauge was not sealed properly and leaked air constantly. What others should know:Buy it if you have to but be prepared to have problems.