I have it and it works great. One caveat: Google Talk support for obitalk ends on May 15, 2014 and you will have to find another VOIP provider by then. There are over a dozen to choose from. I’m waiting to read reviews to select my new provider.
Thanks. I was unaware of this. I thought that google would start charging at some point but it seems it is cutting our your ability to use obi with it
http://blog.obihai.com/2013/10/important-message-about-google-voice.html?m=1
message on the end of google talk-obi coordination