Mrcer
OG
you do forget however to take the proffesion drop into account. For example skinning / herbalism as alternatives.
Skinning wise then 20crit rating gives much more crit than 15 agility gives. t.
So that was easy compareable. Another thing is herbalism, but in the end a matter of preference because I personally don't really know if 2,48% haste (calculated out with the duration of lifeblood and the cooldown) or the 1,65% crit (around that I think it was) that skinning will give you. I don't know what is better for a feral druid for instance. But I would probably got with the crit for some reason.
it is a nice trinket, but too weak now I think. In the past some classes/specs had some kind of benefit from almost every stat, like enhancement shaman for instance, and pvp ferals I guess. Paladins.. etc.
But now classes benefit mostly only from 2-3 attributes and far from 5.
The fact that a lvl 39 trinket is almost as good as the alchemist's stone with an item lvl that is more than double as high (equals a lvl 70 tbc blue item I guess) is a bit sad/disapointting. But it was probably the upgradeable versions from quel'danas that really were meant to be of a major and specified boost to a spec other than the 40% bonus to potions buff.
You forgot about Mixology buff. Even though you have to have alchemy to use that trinket, you also gain additional stats from Elixirs.
It balances out.