Gift for a 5year old. He loved it. It is very simple but effective and he enjoyed the challenge of building it differently to see what would happen. I do think it is quite expensive for the simplicity of it though.
Although my children have enjoyed this toy I was disappointed that the building pieces are only cardboard. It is fun but over priced for the quality, in my opinion. However, it is a good idea and I can imagine that my children will use the blasters with other toys, such as their building blocks, when the cardboard pieces supplied with the set wear out. I also wish that the supports which you attach to the bottom of each wall piece to make it stand upright were a different colour. They are clear, which is probably to make sure they don't show on your buildungs, but in reality it means your toddler almost ingests one daily and you discover that there is in fact something more painful to tread on than Lego.