Went to see it with my kids, I would thoroughly recommend it...ok its not got much more of a storyline than a promo video, but they give you tons of excellant 3D, (Which does go weird when you turn a corner, but since its in a haunted mansion that just adds to the feeling of otherworldlyness)
Its not as long as a normal film, but if you've been to a 3D Imax before and felt shortchanged on the 3D effects go see this.

If you are into that sort of thing then you may wish to get mashed up first.

(There is a slight rock theme to it although that is slightly embarrising)