I saw Spark last night, and I can safely say I won't be going to see it again. It's 100% not my thing.
It's just you being assulted by noise and lights for 20 minutes. (And I like laser shows) but this was just sensory overload. I prolly should have pushed harder to leave early, but my dad and I were also hoping it'd get better. It did not. The tech is impressive. But the music isn't. And it's not even that I don't like that type of music, it's just entirely too loud for me to enjoy, as well as the light display being too fast, it did not make a good combo for me.
My dad thought the preshow/hype team was much better than the actual show, and I'd have to agree.
Personally, I feel like lasers are good to be set to music that you can 1) sing along with or 2) get high to and mellow out. (Not that I really want that either.) Or it's used to tell some sort of vague story.
This was just.... Lights and noise.
Light Balance was very good, and I enjoyed the whole show.