Review on Marble Building Blocks for Toddlers - BRICK STORY by Eduardo Locke

This is NOT compatible with other brands. The product itself is as advertised and my son loves the serpentine tubes but we bought these to add to his marble dock building blocks and this set just doesn't work. We mixed together Duplo, Mega Construx and generic brands, this is the first set in NOT one size (btw it doesn't work with lego sizes either) so this exceeded the purpose for us. That in itself was good, but will never expand my son's building skills. If you're not buying it as a separate set, unfortunately skip this one :(