Ok I know this is very popular topic but still I wasn't able to find answer that would satisfy me (or rather reasoning behind it). People are divided into two camps, one say mastery is best, other haste. But I really see no reason to ever go mastery for disc. At best reforging all your haste into mastery will give you extra 2-3k absorp on PW:S and its even worse for Divine Aegis. So why people love mastery so much? I really wanna know answer to that question...