Took a workshop with Kaye about 3 yrs ago and haven't ironed until the block is done since then. I find I have less distortion when I don't iron - esp with bias seams. Plus, I HATE to iron, so I loved Kaye's method. If I have a lot of intersecting seams in a block, I will sometimes use The Fabric Folding Pen. You run it along a seam and it wets (water and some light starchy stuff (or Best Press when starchy stuff gone)) the seam - then fold the seam - lays almost as flat as if ironed but easier to reverse the fold if needed.