We've had a number of service interruptions for our pair service, particularly POP/SMTP mail. REcently, we received an email telling us our service was to be migrated to a new server. On the day that happened, we instead lost all service and spent half a day on the phone with their tech team trying to diagnose why our account had been deleted from the old server but not moved to the new server. This was a pretty typical event -- things operate ok until they have to make a configuration change, then all hell breaks loose and we're the ones who have to step in to tell them there is a problem because they don't monitor effectively.