I agree with the positive reviewer. My just 6yo can navigate and do most of these experiments. It's true that, if you make a mistake, you might have to start the experiment again... but I loved that: that's real life. I struggled for 5 minutes before I realized I had to pick up a piece of lab equipment in the right way. Absolutely - I'll be more careful next time! It isn't as 'big' a program as, say, Science Explorer, but I think the price reflects that.
As a homeschooler, this is the lab I don't have. Highly recommended.