My only complaint is that the Obi can be confusing from a consumer perspective. It's not clear, from their marketing, which services are on the Obihai and which are from the operator.
So yeah, the little Obihai is a kickass little adapter. It even does direct Obihai to Obihai mesh networking; a neat little trick.
As a newcomer to VoIP, a lot of it is confusing. I don't consider myself dumb or technically naive, and I've found it pretty difficult to get my head around how all this stuff works.
The Obi is so close to being an awesome consumer device and it was no problem for me to set up, but it's not at the "I can buy this for my parents" level of easy yet.
(FWIW, people like windexh8er totally don't help this situation. Well-reasoned suggestions and links to good documentation would serve the community better than trollery.)
If you wanna get an idea of how stuff actually works in VoIP, we cover the topics in depth every two weeks in our Expert Q&A sessions (next one is on Porting here:[0])
Here's a link[1] to 4 of the past ones so you can get an idea. We'll be publishing the videos on youtube soon. If you attend these, you'll quickly start to get a good handle on the world of communication; it's just a TON of acronyms.
Here's a link to one of my favorite blogs on VoIP [2].
Hope that helps!!!
[0] http://www.eventbrite.com/myevent?eid=7476736119
[1] http://blog.2600hz.com/post/52151527067/2600hz-expert-q-a-re...