One pretty minor thing that bothers me is that the webcam and mic mute toggles and the hang up button are blended in and out on moving the mouse cursor during a call. I'd prefer to at least have the option to let the toggles stay onscreen as I tend to use the mute mic toggle a lot during a meeting. Also there is a moment of awkwardness every time a call ends because many participants look for the end call button.
It's a great thing that I can use my Smartphone as a mic during a meeting. Would be great if this could be expanded to my phones' cam as a webcam replacement.