I just wanted to supply my experience so far:
I did the switch last Tuesday to PhonePower from Google Voice and to make the change I just went through the ASP link from my dashboard. Once I selected the SP slot and completed the sign up with Phone Power, my Obi 202 was configured with the correct information.
I do mainly toll-free calling from it for conference lines, but have done a few land-line calls, both local and 1/2 the country away. I haven't had any drop connection or issues with PhonePower staying registered or configured. I'm running FW 4350 on my 202 and it's been solid since switching. I was really worried with so many people experiencing issues, but so far it's been solid.
I will be watching it for the next 2.5 weeks to see if anything changes or any issues occur and I will post back follow-up on it, but so far, so good.