I just have, and I like its attractive User Interface and general ease of use.
But what's more interesting is something Mike told me.
"I think it will quickly displace xten (actually CounterPath-ed.) and sjlab's products because it has very good call connect reliability which has always been an issue trying to send/receive Asterisk calls outside of your local network," Mike writes.
The key to Gizmo 2.0, he says, is Asterisk compatibility.
"We now have Asterisk support which is great because it connects to Asterisk servers, but still uses Gizmo backend smarts to navigate firewalls/routers/NATs if necessary to make sure that media is successfully relayed," he tells me. "This makes it a superior user experience to other standard SIP clients which don't have a back end network to leverage."
But Gizmo 2.0 is not just an Asterisk-only, one trick pony.
"Besides Asterisk, users can connect to any other SIP network. And again, they will leverage Gizmo Project's network navigation system which will select UDP and fallback to TCP if unsuccessful, use a media relay when required as well as identifying the user's geographic location so it will use the closest media relays," writes Mike, who adds that SIPphone has data centers around the world to insure low latency for calls."