Polycell 5190663 Smoothover Tool Set Roller & Spreader

This tool set is about as useless as the product itself. Now, I can plaster and have always done my own building and decoration work but Smoothover is a waste of time, does not perform as described, and the tool set itself may be a brave attempt to make the product work BUT... would you put, say, Pollyfilla on with a roller? The smoothing tool is useful for wiping down the shower but if the product does not work what use is it? I am still trying to find a use for the roller...