I have had my MJ+ for a little over a week now. Overall, I really like it. I have had three lengthy conversations and numerous small calls and the quality was great.
The only real complain I have it that the MJ answering service picks up automatically after the fourth ring. I prefer my phone's answering machine to pick up after the fourth ring instead. I know you can set the physical answering machine to pick up after three rings but that's cutting a little too close.