I have been to the U2 concert in the Ziggo Dome last Tuesday. Since I had no accreditation I couldn't breng a DSLR or big camera, So I took my small and trusty Fuji X100. And I must say that little monster performed really well! I had a nice spot near the B-stage with only a 2 or 3 (large)people in front of my, So it was holding up the camera and hope for the best. And I must say it was almost a better spot then the spot that was for the press photographers.
I always work in manual mode during concerts. This because of the chancing light and the dark clothing. If I set it manual I know exactly how to set the exposure.