RE: Vanish Point
I got to the park around 12:30 and stayed till closing. I missed the ribbon cutting, but it doesn't sound like it was anything particularly special.
Drop: Coasters don't scare me. Most water slides don't scare me. This scared me. Being shut into that drop tube knowing that the floor you're standing on is going to disappear any second now is a genuinely scary thing (for me at least). The first time I rode it I was sorta holding my breath waiting for the drop. Bad idea. Take a deep breath right after saying you're ready because breathing while you're on the ride is basically impossible- don't even try it. I found that I couldn't really enjoy the ride at all because of the absurd amount of water that was splashing onto every bit of my face. If they don't do anything to fix it, I would of them rather just put the things over a pool and let them drop you into that. The drop itself is great, but the rest is just annoying.
Slide: I definably preferred this over the drop. Again, there was a ton of water in my face and again, you can't really breath while on the ride, but it's much less of an issue because of how quick the ride is. Keeping your eyes open is also much easier on the slides.
They'll both be a hit with the general public, but the thing that worries me is the capacity. Expect some long lines as the season begins to pick up.