The call quality is high but if you have headsets that aren't very good it can create issues with audio.

Sometimes calls are choppy due to it being over the internet. However, the flexibility of working form anywhere out ways that small occasional inconvenience.

The navigation within the internal system can initially be a bit difficult (i.e. the naming of the tabs are not always clear), but once you know where to click, it's not too bad.

Background workflow good but still not as flexible as others, Salesforce service cloud for example.