Well... It is different, for sure. I don't know that I like it - because there are a couple things I don't like....
I don't like that it is not open-source (but neither is teamspeak). I also don't like that it is centralized - but only because I have questions about privacy.
I think the feature set is amazing though - you can direct call and message friends across servers. And I am honestly fine with the browser version.
It really is skype and teamspeak3 smashed together, but I never really liked Skype...
But, it is just another tool in the box... Not that we have to use it...
