mrjoe,
The ObiTALK service is not been 100% reliable. It has been somewhat flaky since day 1. I think for the time being that you can consider it as a back up/alternate service. It would be hard to justify building a business around the OBiTALK service if it can not be reliable. I suspect they will need to improve this service if they expect clients to pay for the OBiPLUS service since I think it relies on the OBiTALK service.
Just like GV, when the service is FREE, it is difficult for people to justify a complaint. However when people start paying for the service a new level of standard is expected and Obihai will be held responsible for any downtime. A case in point, whenever a Voipms server goes down there is an immediate thread discussing it on the "DSL Reports" web site. Any complaints at this point can be justified. Since the OBiPLUS product seems to be targeted at small/med sized business, and having said this, I think it might be a good thing for everyone owning an OBi device since I would expect the overall reliability of the service to be taken more seriously by obihai.