My daughter (almost 6 years old) and I did this yesterday.
We had so much fun and I'm so proud of my daughter for trying. She was a bit nervous as when you're there, it's bit noisy and looks a bit intimidating.
The staff was very helpful and it felt very safe the whole time. It's a bit pricey as it's $75 per person for what they say is 3 minutes of "flying" time although if you actually measure the flight time, I would venture to guess it's closer to 1.5-2 minutes.
Fun, safe and definitely worth trying.
The facility shows it's age and looks a bit dated. It's not shiny and new. And by the time we were there (afternoon), the wind tunnel room was very hot. They said it starts cold in the morning but gets hot by the afternoon due to the heat from the motor blowing the air.
The instructor that's in the room with you is very helpful and managed to have my daughter do tricks (while holding onto her). If he let go, she probably would have flown to the top of the room! She says she wants to do it again!