It also has a nice side effect with Death Saving Throws as well. 1-8 for worsen, 9-18 for no change, and 19-20 for being able to use a Healing Surge and get back up again. Rather then needing a 20.
A Human wizard with Bloodthread Armor[Cloth](+2 to Saving Throws when Bloodied), Human Perseverance(+1), and Ring of Protection(+1) can roll a 16 or higher on a Death Saving Throw and get back up on his own. And most ongoing effects are gone with a roll of 6 or better when bloodied, or 8 or better for non-bloodied.