the scoop on the SB is that it does not let you iron, move the iron around, only press, just laying the iron down and then lifting up. It forces you to just press so you don't stretch or distort the fabric. Great for small piecing projects or thin strips or just if you tend to iron things all wonky. Also, it cools down quickly so you aren't buring your fingers.
If you go to the irong board witha 5 inch square and walk away with a 5 1/2 by 6 inch parallelagram.... it's the product for you :)