IMO, stability is fine. The number of complaints (whether here or BBR forum) about service problems has gone down significantly. However, I will remind you (as if I need to.. ) that you were having stability issues when I was not... If you're willing to give it another try, I'd recommend signing up month-to-month with a throw-away number to see how you like it. One new feature Voipo has added is that you can 'verify' that you 'own' a number and, once done, set your CallerID to that number. That way, if you choose to port in later, you can set your outgoing Voipo calls to show the CID of your primary (non-Voipo--other Voip provider, cell phone, POTS, etc) line. The other point I'd make, FWIW, is that when CallVantage closed up shop, I ported my home number to Voipo, and my wife has not complained.

I don't really know when the maintenance windows are. I can say that I have not noticed any regular periods of phone downtime, just an occasional blip that never lasts for long. (As a Founder's Plan recipient, I have sip credentials and operate my line on an Asterisk system. For my own morbid curiosity, I installed a script that checks the registration status of each of my Voip accounts, including Voipo, every five minutes. I haven't gotten a notification since Nov 8 (that was a single occurrence, less than 10 min duration); the last 'downtime' (defined as two or more consecutive notices, such as 7:40 and 7:45, or 3 notices within a half hour inclusive, such as 12:00, 12:15, and 12:30) was Oct 31 at (unfortunately) about 7:30-8AM. Prior to that, I had opted to switch servers at one point in August (forget the reason), and I didn't reset my script, so I got false outage notices... Point is, I haven't been significantly impacted by maintenance windows.

As for the 2nd year free offer... The main difference between that offer ($175 for year one, 2nd year free) and the current offer ($99/yr) was $25 over 2 years, plus they apparently didn't collect the taxes/fees for the second year ($36) for a total of $61 in savings over 2 years. It being Black Friday and all, I can't speak ill of saving $61, but over 2 years, that's under $2/mo... I would confirm with someone in sales, but many of the promotions they currently offer are also available to existing customers. So, if you sign up on a monthly plan, you may be able to 'upgrade' to an annual plan, should you decide to port your primary number back in. Of course, with Voipo's early termination policy, you can get the $99 plan up front and should you leave early, your refund would be calculated at $99 - (months used * per-month rate of $15), so there's no real disadvantage to signing up for the annual plan right off the bat (except, of course, for the up-front cost).

One other comment, in case it matters to you: Voipo is sending out RT31P2 devices now--you probably will not get a PAP2T.

Oh, and sorry for the long-winded reply.