I was hanging with a good friend of mine in game "Zyndar" and he brought up the topic of drinking a "Guild" Remove Curse Potion vs. a "Standard" remove curse potion usage speed.
Apparently these differences are a result of the different usage animations where the guild potion uses a "Drinking" motion, where as the standard potion uses a "Casting" motion.
So, this is apparently why you can use all the Guild potions on yourself when "Madstone" Raged and none of the standard potions that involve casting animations.
Not only that, the Guild potions are significantly faster.
I see these guild potions as potentially a life saving must have for anyone running content where you are getting frequently cursed and need to get rid of those curses quickly.