I have been using Skype for 3 years, and it is always my first choice for making long distance calls to my families and friends oversea, I was impressed by the call quality even with the poor network. Now I am a paying user for me to get cheaper direct calls with telephones/mobile phones. which I found out it is very convenient by doing it just on my smart phone, and another thing that I found out is that Skype has the best video quality on video chat compares to other VoIP or instant message softwares like QQ, Wechat, etc. The experience of communicating with classmates by Skype was definitely pleasant: clear and fluent. I think Skype in the VoIP market dominance is unshakable by now.