I think these are a brilliant idea - I could only afford the special as I am a pensioner but will be buying pieces as I can afford them - I love the space saving and also being able to cook a cake and then just release it - so amazing
Perfect for takling on a plane trip - folds to a compact mass, no risk of security concerns re bottles.
They look good though maybe a bit small. I would really like a larger one to use for baking cakes