Seriously, perfect... every time. I don't make hard-boiled eggs that often, and I'm always anxious how they'll turn out when I do... because sometimes they don't. This technique produces hard-boiled eggs that are just the right consistency (not rubbery) and it totally eliminates the dark gray-green discoloring around the yolk. What more could you want? O.k. don't answer that.
Try it, you might like it!