I have the clover and use it for pressing the intersection of seams on my Farmer's Wife blocks. When a bunch of seams come together my big iron just makes a mess. I spray a dab of water on the intersection, put the clover on it, do that with all the intersections on that bit of the block then finish with my regular iron.
I got it at my local quilt shop when they were having 25% off of notions.