Just for anyone else - although MC turned off my number so I had an out of service message for the past 4 days, Ooma did port it today...so I'm back in business.
I wish it was easier to port but unless I returned the modem it didn't seem like I'd get ported.
Anyway,. so far so good on the ooma side.
I went with OOMA premium because 1)it was cheaper, 2)you can use a community spam blacklist and create your own blacklist of 256 numbers while on MC you get a whopping 12, and 3)you can get SMS and email alerts of voice mail and get a VM attachment on email. Much easier than dialing in, etc.
Of course while in some way it's still a land line, I'm a dying breed...