I have a bunch of memorable experiences from it, including:
1. Under inflating the first balloon because our helium provider was closed, and instead buying lower pressure "party" balloon containers (and not realizing until too late that lower pressure meant more helium left in the containers)
2. Chasing down the balloon at night and trying to explain why you wanted to walk onto some guys field to check for a weather balloon
3. Later calling a gas station to ask if "some guy just arrived with a weather balloon in their truck" when trying to track down the balloon
If anyone has kids and wants a fun project, I highly recommend it. There are a few companies online that sell kits, and it's neat to watch the different layers of the atmosphere (temperature and wind), and try to "chase" after the balloon and find it afterwards.