A few pages back, several of us had that very discussion -- check it out by
starting here and advancing several replies.
A week later after lots of listening, I hold the same opinion that I did on day 1 when I made that post: I personally can't tell an audible/discernible difference between Red and Mojo. There might be plenty of measurements and tests that indicate a difference...and I'm sure plenty of other users say they can hear a difference...but if I'm being completely honest, I cannot.
On top of that, the convenience offered by Red really puts it over the top (in my opinion). I've already had one instance with Mojo when I came back and was looking forward to listening to music, but after one song it shut down (dead batter). Never, ever having to worry about battery/charging (plus the tiny form factor) is so awesome with Red. I don't even use mine with portable -- it's for 100% laptop use. Because of that, I too am using Jitterbug and I really like the combo.
Because of all this, I will be sending Mojo back and using the $400 differential for other things.