I'm taking the "wait until end of April" approach, letting people that want to be on the bleeding edge do so. Then, I'll evaluate what seems the best at the time.
I won't be going, no matter what the price, with a service that seems like it's being run out of a guy's basement. Having used Callcentric for a short period for E911 and learning that their database was corrupt at one point, they got hacked for weeks, and then they didn't have their own generators or a co-located center, I'm not going to pick Fred's basement service, which is what one of the options I've seen discussed.
I also question why I need to pay up front for a year. If your service stinks, I'm leaving, and I expect at least a pro-rated refund.
I've also got to say that I've been really disappointed in OBi. The device was much more difficult to get working than it should have been - and I'm fairly technical although VoIP is new to me. Their firmware update process is garbage, we had to teach Sherman the right way to post an update so that we'd get notified, and that worked for a short period until he stopped doing it. Calls to him and emails to his attention never got returned. As a result, I stopped updating my firmware because my device was working fine.
Switching to the OBi and GV was right for me at the time - I dumped my landline and saved money, but ran into issues with my internet solution for my home alarm and had to switch to cellular for that, adding the cost of that device plus a monthly charge. While that monthly charge, plus whatever I will need to pay for future phone service after the OBi/GV connection breaks, will still be somewhat less, saving $15 or so a month really wasn't worth all the aggravation. Yes, my alarm system is now not vulnerable to a phone or internet cable being cut, but I wasn't that concerned about it.
I'm leaning towards dumping all of this stuff and switching to linking my home phone line to my cell line via Bluetooth, which is how I have my 92 year old in-laws set-up (they have emergency buttons on their wrists to summon help in Assisted Living, so no E911 is needed). It works well for them, and would likely work well for us. If we make all our outgoing calls on our cells, then the only thing I have to resolve is that GV will only forward our home number to one cell phone, and that's problematic. I may look into porting our number to one of the services that gives free incoming minutes and just never use the outgoing.