MJ is far from perfect. I use it as my "line 2" for my family to use on the days that I work from my home office. My work calls all go through Avaya and my POTS line when working at home.

My MJ is plugged into my file server in my basement for 24/7 service.

My wife has faxed out through MJ several times without problems. That was a surprise to me.

I beat the single phone issue with MJ by connecting a single base station for my 4 Panasonic cordless phones.

We now make all of our outgoing personal calls (except international - those use Google Voice) through MJ.

Call quality ranges from very good to sometimes poor.

I'd hate to not have a POTS line in addition to MJ.