I can see where Podcasters and early adopters are all over Gizmo–it has a built-in recording feature useful for Podcasters, a cool map, and maybe most importantly it uses open standards.
But here’s the key: Skype just works. Does Gizmo?
One of the beauties of Skype is that no matter where I am Skype seems to work. That’s one of the reason’s I rarely even try using MSN Messenger’s built-in audio feature when chatting with someone.
Gizmo’s president Jeff Bonforte responds here that yes, they know what they’re doing and Gizmo is as “agile at traversing NATs as Skype.” His full response to a user that was having some troubles with Gizmo:
As far as the other questions and criticisms from the people above that have never even used Gizmo, we have done WAY more than simply do SIP on UDP. We are as agile at traversing NATs as Skype. People should try the client before making these assumptions. Second, like almost every VoIP service we do lots of P2P. However, we do not need users machines to route calls. We use a private fibre network for that, a strategy we share with little players like Google and Yahoo.