Feels like the infrastructure and on car issues are going to be similar to CNG, but worse. Need new fuel stations, high pressure storage, no existing delivery network (worse than CNG; although CNG pipelines are much lower pressure than vehicles need, so you needed a compressor at the fueling point); and the killer --- the vehicle tanks expire and replacement may not be economically feasible, in which case your car's value evaporates when the tank expires (generally 15 years after tank manufacture); this is what happened to most CNG cars.