To each his own, but I pretty well couldn't disagree more with both of you. I have used MJ for close to 3 years now (have been using the GVJack App almost exclusively for the last few months however).
The only thing I have regretted in dumping my POTS and using MJ as my primary phone is that I didn't do it sooner.
Not sure how it works in Canada, but their 911 set-up worked perfect when I used it to report a car accident in the neighborhood last year. They told me where I was calling from as opposed to having to figure out where on the continent I was.
The device obviously doesn't work for everyone, for many reasons. But if it does work, I think it's a complete waste of money to keep an active POTS line.
I do agree with the porting advice, especially with them charging an annual fee for the privilege. Tell friends and family that they will get over the pain of a new number in a few weeks.
To Sr Tech. Unless things have changed recently, Caller ID services have always generally been broken down between "Caller ID" and "Caller ID with Name".