I just spent about an hour on the phone with the folks a Wise Owl Inovations who are the NA distributors for Roverdrives. Apparently the lack of ODs is a result of the manufacturer not problems with the design or with the solvency of the company. They told me they keep getting promised ODs but they never show up. They also said that if they can get emails from people that are serious about buying a Roverdrive that it would help them with the manufacturer. So if you are going to buy a Roverdrive drop Wise Owl a note sales@wiseowlparts.com and tell them you want one. It may help getting the manufacturer of dead center.
Jim