I share the positive assessment of most of the reviews, so here is equal to my review: The soldering of the axes is a cramp. Fat-metal axes with cheap soldering iron, as are present in student strength in schools, requires discipline and consistency that falls children hard (we have a little talk with 2 30W soldering iron it) - especially when the result is then not motivating fails ( "Well .. it was better not")
In addition, minor errors in the manual, but a successful style and tone companion for assembly. A project that 8th / 9th-graders leads to their limits - in a positive sense. Then you can afford but not (frustrating) errors in the material.
