Lost In The Machine: The Mirrodin Artifact Review, Part 1
The ability to drop the Lightning Greaves out and then give a new creature haste each turn is quite good (and it’s not just for combat; try these with mana creatures!) and in many cases the untargetability will also be highly useful. The problems come up when other equipment starts showing up and you can’t get the Greaves off so that you can put the other Equipment on (let’s face it, monsters have a scary tendency to die in Standard), not to mention the bigger concern – namely, that the Greaves are outstanding when the first copy hits, and you do want it early, but that second copy is a whole lot less sexy than your second Bonesplitter or Plate.