Look at the specs for the fans: 12CFM, 26CFM, and 27CFM? Look at the amperage too. IMO, Vantec is basically selling you a low RPM, low amperage fan and calling them "stealth"

You can do the same with the 7V trick or a bay bus (voltage regulated or rheostat). The lifetime warranty is funny too, because any fan that runs at such a low RPM will probably last a long time too
