Three general problems (well, four if you think about it):
- range. 280 miles? You need quite a few H2 stations if that's all you can travel on a tank

- weight/efficiency. I think that car's using compressed hydrogen which is extremely expensive per unit of energy. Those tanks also weigh an extrordinary amount. Oh, and I guess if one crashes, what happens to that compressed H2 tank if it is ruptured (I think "owie" might be an understatement. While the production cost of hydrogen is low, it is expensive to store and transport hydrogen in cryogenic liquid or highly compressed gas. Transporting hydrogen in these forms requires expensive new infrastructure: tanks, pumps and delivery vehicles. Low-cost pipeline delivery is not possible

- cost. aside from the compressed H2 issue, that fuel cell probably ain't cheap. Efficiency goes down as water collects on the membrane, and can short out the dang thing. Hopefully, there is some way they've fixed that issue. Also, I think there is a lot of platinum in the fuel cell, which (last I checked) isn't really that cheap

- source. Right now, the majority of H2 produced is from NATURAL GAS (a fossil fuel). So, this "green" technology may not be so green after all...

It is a step in the right direction. And, if the new H2 technology does pan out (Hydrnol by Asemblon - check it out.. Hrdrnol info ), we could really get off the fossil fuel highway.