I've been really enjoying MainStage 2. It's really easy to construct a fun Concert of Amp Designer amps, a cool pedalboard, and just play!
I'm at the stage of getting enough songs together to start playing live again, and it's looking like my rig will be my MacBook Pro and MainStage 2! And a few custom guitars, of course. 
And speaking of MainStage 2, I wanted to post the MainStage 2 feedback address here:
http://www.apple.com/feedback/mainstage.html
If you have some ideas, or if you've found some bug or issue, posting here is a good way to reach other users, but the address above will get it right Apple. As ever, don't count on a response, but this is the best way to make a difference and get issues right to the developers.
Orren
And speaking of MainStage 2, I wanted to post the MainStage 2 feedback address here:
http://www.apple.com/feedback/mainstage.html
If you have some ideas, or if you've found some bug or issue, posting here is a good way to reach other users, but the address above will get it right Apple. As ever, don't count on a response, but this is the best way to make a difference and get issues right to the developers.
Orren