We love our mallard trapezoids! We use them to support fort builds, as seats, balance beams, and a step for my toddler to climb onto the couch. They take up less floor space than a triangle when used as a vertical fort support, so they have been great for builds. We have had them for about a month and find the foam is a little softer than our rockers, so they have a lot of give if adults use them, but easily support kids with minimal give. We did have a defect in one of the covers, but WK custom...