I have 3 -- two are squares and one is the Brooklyn Revolver with the ironing surface on one side (wow has that gone up in price). I use the Brooklyn Revolver the most with the large square second. I have had the Brookly Revolver for several years and use it on every project when squaring blocks or for HST. Love it. The squares do no turn as well, but they work for wierd size blocks. If I did not have the revolver, I would save my pennies for the martelli -- the round does not need as much extra space to rotate as the squares.