I talked a little bit about this system in your other thread (in general). We do not sell it, but I have seen it a couple of times....in businesses where we pulled them (2 so far) after less than a year in service. Techs that saw it have called the voice mail "archaic" (even compared to low level digital systems or other IP systems) for both applications we pulled out.
Could have just been the installation company though. A bad install can make even a good system poor.
Steve