I just bought a pair of the Ice Toolz 4-in-1 headset wrenches a couple months ago. Seemed a no-brainer for the price and they are more stout than they need to be. (not thin stamped metal). I can't compare their size accuracy to anything else, since this is my first set. I've set at least one (Stronglight) alloy headset and two steel ones so far, and they seem to fit nicely; not too much slop. But since headsets don't require a ton of torque, I'm not sure I'd notice.