Product Review (submitted on February 17, 2012):
They are more durable than you would think but believe me they pop if your not careful! They stood up to me being a little rough to them at the neck while I was setting up a experiment but once I was all ready it mysteriously burst. That was such a letdown especially after 2 died. Purely user error it would work great for the intended purpose or less adventurous uses. The only drawback is the price. They stay inflated for a long time too. I had one set up for a week and a half and it didn't lose a cm of diameter. It is just such a heartbreak when one burst. I have only had experience with the 200g balloon.