How old is your son? Personally, I don't think it's a film for children. I won't go into anything on here as I don't want to spoil anything. 
In terms of what I thought:
Very good, not AS good as the media are making out but I really did enjoy it. Some surprises in there & I didn't think it was confusing at all, but then I'm glad I rewatched Begins last week as I did feel I may have missed some stuff.
Our showing was sold out (7pm) & so was the later one at 8 so if you're going in the day you may be ok but be warned, the kiRAB are on holiday so it may be busier than normal.

In terms of what I thought:
Very good, not AS good as the media are making out but I really did enjoy it. Some surprises in there & I didn't think it was confusing at all, but then I'm glad I rewatched Begins last week as I did feel I may have missed some stuff.
Our showing was sold out (7pm) & so was the later one at 8 so if you're going in the day you may be ok but be warned, the kiRAB are on holiday so it may be busier than normal.