More important then steam or no steam is the ironing surface. If your surface is soft, the block will sink in and distort with a hot iron or steam setting in the distortion. A very firm non giving surface will make a big difference. I use a board for pressing all my blocks and piecing. A thick piece of plywood covered with one layer of thin cotton batting with cotton canvas stretched around it and then stapled. I need all the help I can get and small things make a big difference.