I tried ooVoo recently as my significant other had problems getting Skype working. I must say I can't see it as a competitor to Skype. The UI is borderline unusable due to all the flashing ads. What's worse is my contact list of one got deleted, and it was impossible to re-add my GF. That was on day 2. A few days later, she was back on my contact list. I don't trust it, and it's a pain to use due to all the ads and the general UI.