I received my 42cm crazy paving mould on a Friday and used it first the following day. I needed a natural looking path for pedestrian traffic only that could weave its way around trees and gardens and provide safe footing at a swimming pool gate. The mould is very quick and simple to use. I was surprised that I could fill it with concrete and remove it within minutes to relocate it and use it again. I am pouring my paving on a layer of road base and pouring it a little thicker than recommended so that each paver is still connected to the one next to it. Each mould uses a half bag of concrete. I am very happy with the result.