I've been doing some reading about MainStage too ... I don't bring a laptop currently on gigs, but it seems like MainStage would be a powerful and inexpensive "app" to have (along with a decent controller). From what I read, even the included VI's sound very good (pianos, organs, synths, etc.) and the app is only $29!

-Jim
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Genos / Tyros5 / HK Lucas Nano 600 / FTB Maxx 40a / EV ZX1A / Rock'n'Roller cart / Hauptwerk virtual pipe organ / misc other audio & music toys