The Bottomless Potion of Mutilation

I was playing the other night and one of the monsters I killed dropped a Bottomless Potion of Mutilation. According to the Diablo III Game Guide the potion instantly restores 60% life and
increases life per kill by 4000–8000 for 5 seconds.

Apparently, aside from the Health Potion, there's a whole variety of potions out there now.

Bottomless Potion of Kulle-Aid
Bottomless Potion of Mutilation
Bottomless Potion of Regeneration
Bottomless Potion of the Diamond
Bottomless Potion of the Leech
Bottomless Potion of the Tower

Haven't had the chance to use it. Frankly I'm worried I won't see one again so I'm keeping it until I get new ones (or one of the others, whichever comes first).