The real value in double amp isn't the trinket proc, its the fact you gain the extra 8/9/10% Crit damage/healing and mastery, the Prison trinket is BiS not because of its proc but for the static % increase it gives, so having 2 of them is twice as good. I ran with double amp when progressing 10m, and swapped to dysmorphic when we went 25m (As I felt, at that time, the static int was better than the % increase in 25m)
Oh Draco, wish we could drop healers and have some fun, best we do atm is 4 heal all fights except thok and garrosh, the others healers moan at me for even using spirit shell now
WTB 2 heal!