[H] Internet Telephone Services - Ooma etc

[Veech]

Has anyone had any experience with Ooma or any of the other internet voip 
telephone products?  They claim that with a one-time purchase of the Ooma 
device that you can basically disconnect the phone service and everything 
will run over your high-speed internet.  They claim you can have the same 
services such as call-waiting, caller ID, 911 service, along with unlimited 
local and long distance calling across the US for free, meaning just the 
cost of the high-speed internet.

Thoughts?
 http://www.ooma.com/