I have MJ and the service is fair IMHO. The sound quality deteriorates over long calls, but it's very, very good at first. At times I can't through to very rural phone numbers too. Like others have said, you get what you pay for. When the sound quality starts to drop, I just call back and it's fine for a period of time.
Another problem I've run into is trying to call a business with a call center (think motor vehicle department) and by the time they pick up the phone, they can't hear me. It's a one way call issue and I could do a packet trace and nail it down but why should I do their work for them? :read2:
It's not really a good mobile solution as you must have internet access. Generally on the road that means wireless and some hotels have their firewall set up to block Session Initiation Protocol which in essence will block voip, which is what MJ is, a cheap voip solution.
