I got to check the Telus Spark centre out as part of a free event. I must say that I was a little disappointed in all that it contained. I'm not sure quite what I expected. There are lots of stations where you can explore and learn about science related things and the Dome Theatre is amazing. It is definitely a good place to spend a few hours in especially if you have kids. As an adult I don't think I would find it a place to return to again and again. The staff were great and always ready to demonstrate something but it is a place for kids. Adults would derive some enjoyment but it's one of those places that you sort of check off your list as seen it.
The theatre is amazing though. I would go back for the shows in the Dome Theatre more regularly, There are 4 projectors with so far only 2 used for each show, one projecting the top half of the dome and the other the bottom half. You can go and just see the show or you can pay a combo fee that includes admission to the Centre. A good idea they've started is the 1st Thursday of the month is Adults Only evenings. It's a fun place to spend a couple of hours in even as an adult but not something I would do regularly, I would probably check out the Centre once a year or every couple of years but would check out the shows more often.