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I have years of experience with fuel cells ranging from working at a machine shop that made cells selling to the company for $34,000 to doing lab testing on smaller ones for my university. They work. Almost always you feed in hydrogen, it consumes oxygen, and outputs electricity. The hydrogen is ideally created through efficient and green processes such as wind power like the hydrogen car refueling station in Montpelier VT, by my university. Besides high costs compared to capacity, the cells biggest drawback in my experience is that the cell membrane corrupts quite easily. A lot of little things can taint it and it won't work right. That could simply mean it doesn't output optimal power or it could just stop working. Also be warned, their power output is not constant...
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