Very nice. There are times I have wifi but no phone, and need to make a quick US phone call.
I'm not sure most people know the sidebar of gmail as "Google Hangouts for the web", rather than "the contacts list in the sidebar of gmail", but okay then!
There's also a Chrome Add on which will drop a little icon in your system tray, which clicking brings up a window in the bottom of your screen which you can start calls with as well.
