Muse opening for U2 (2009 tour), is it worth it?

I would love to see muse this year (Raleigh, NC), they are opening for U2, but I am wondering if it is worth it or do they just play a couple of songs?, I have never been to a concert before so I don't know how the opener(special guest) works. And I like U2, but I am not a big fan.