Re: imax cinema
It all depends on how much you value the cinema experience, and to what extent you appreciate it. If you can't, and don't go very often, then it's definitely not worth the extra money. I love films and the cinema so think the IMAX is warrants the extra expense.
Last time I went was the Saw all nighter that ran from 9pm till about 10am, which was pretty harsh on the senses in all honesty!