NWS  I needed an extra number for incoming calls and the occasional outgoing call and Gizmo works perfectly with my Macs. I've had it with the high costs of traditional, old tech phone companies.

The Gizmo interface could be a little sleeker and more compact but it's not a problem.

I wasn't keen on becoming a supernode for Skype, dealing with Euros or payment issues (I had them).

I waited forever for Google's GrandCentral and for iChat to be something more than AIM.

Overall, a fine program.  
(Version 4.0.0.258)