This is the second time I've bought one of these kits and the kids love them of course! How could they not! I do wish it came with a little more of the slime mix though, compared with the amounts of the other products it's only enough to make one batch and it's a very small amount. But other than that I was very pleased!
While these "experiments" are fun to watch and feel, I felt the lack of scientific explanation really made these experiments fall flat. What is the point if you can not explain at least one scientific concept. I bought a bunch of these as gifts to give out for birthday parties we will go to over the course of a year. Every parent has said they wish they could explain why these plastics are growing and other plastics do not.
The nylon backing is very sturdy and is holding up well to my 3 year old's roughness. Its bigger than I expected (around 1.5x3 feet) which makes it a little more difficult to find space on the wall for it but it would be perfect in a classroom setting. I love that it comes with cards for birthdays and field trips. The only reason I'm giving four stars instead of five is because there is no place to store the months of the year cards. They are too big to fit into the storage pocket at the bottom of the chart.