This was one of several toys, including three "Science Museum"-branded gadgets, that we bought for a flight-themed "Science Weekend" with my nephews aged 5, 8 and 10. At £10.99, it was the most expensive, but was the only one from this range that was worth the money. Although the product description claims it is for "14 years and up", it was ideal for our kids, although they needed some supervision and help with assembly.
The launcher is powered by AA batteries (not included) and demonstrates principles of energy transfer and aerodynamics. It is mounted on a plastic board that is held steady by suction cups. The front suction cup can be mounted in different positions to alter the launch angle. The launcher consists of two small motors that turn rubber discs that are aligned such that you can just fit the fuselage of a paper plane between them. As you push the plane through, the rubber discs grip and shoot the plane off the front at high speed.
Not all designs of paper plane work with this launcher - they need a fuselage that extends beneath the wings to engage the discs. It'd be worth preparing for using the launcher, either by buying a book on paper aircraft design, or by looking at some of the many websites devoted to the subject.
The kids loved playing with this, and came back to it repeatedly over the weekend. I'm sure we will use it again. Unlike some science toys, it would be tricky to make a homemade version of this, unless you had a bit of know-how, and parts from a specialist store.
So far, so good. However, I felt that the toy was let down by attention to detail. The suction cups weren't very good, and had to be attached to an exceptionally smooth surface (we used a glass chopping board). The front suction cup leg screws through the launcher at a point where it fouls the plane's exit trajectory, so we couldn't fix it properly - instead we let the launcher balance on it, which is not very stable. And while you should theoretically be able to launch planes at different angles, the suction cups only work at the lowest angle. The launcher has only one speed - it would be more educational if you could test the effects of launching planes at different speeds. The motors do not cut out if left running, so most of our 'supervision' consisted of reminding the kids to turn it off when they weren't using it.
Overall though, this is a fun and unusual toy, enjoyed by both children and adults. Despite its flaws, this was the only Science Museum toy that we were pleased with.