I bought these tickets (2011) as an anniversary gift to my husband because we met at a Three Days Grace concert (1 Mar 2010).
3DG was great!
I had just had a baby, he was only 7 weeks old, and A7X put on a performance with a man hanging, committing suicide, for the Nightmare song, it was really sick and twisted and I couldn't get over it. You can call me a prude, but it was disgusting. I think Nightmare is the only song I like from them, anyways. I know die hard fans will disagree with my opinion on their skit, but I'm entitled to my opinions...
BTW, we went back (14 March 2013) and saw 3DG, ShineDown, and P.O.D., and they were all great.