[MENTION=831002]caliform[/MENTION]: Interesting, can you say more about why? Is it the legroom? Aircraft? Personnel? Something else?

As mentioned above, I have enjoyed flying JetBlue, but Mosaic just isn't much of a reward for my loyalty, IMO. If I were to get upgraded on even 10% of my flights, that would be an improvement over the 0% chance of an upgrade I currently have.

But maybe I'm missing something.