I have the CX-500V. It's the same camera but less capacity with only 32gig internal memory.
While this camera is very good in low light, I found the auto focus is very hard to control. It work pretty good for firework or maybe even Fantasmic, but for the ride...not so good. I recommend switch to manual focus for the ride.
I tried it on both Pirates of the Carribbean and Expedition Everest. Both occasion, I have to re-record with manual focus.