Skype Vs. Tango

I have been a long time user of Skype and for the most part am pretty happy with its service. However, recently I have come across Tango. I visited their website and it seems to be fairly well laid out with good features. My question to you is: Have you used Tango? and would you recommend it over Skype, or is Skype still the king of video chat for the foreseeable future?