I agree that it's insufficient (but a nice start). He doesn't, I notice, seem to list trikes of any kind, nor power-assisted bikes, nor multiwheelers. Nor does he list what, if any, substantive differences there are between the ones he lists. Why would someone want to buy (e.g.) a Seven rather than a Waterford? That might be the biggest shortcoming since, as AR notes, not many people buy solely by price.