Originally Posted by
Teevo
Assuming you're actually looking for conversation regarding gemming:
The reason I stop at 10% expertise, is because the higher it goes, the less you benefit from it. The odds of you seeing a parry at 14.99% expertise are ridiculously low, for example, especially if you're only looking for parries when you absolutely don't want them (i.e. need chi for purifying brew). After 10%, I don't feel that the itemization points spent really benefit me as much as pumping those points into haste or crit would.
As for haste, once you hit a comfortable level of energy regen (which is dependent on the player, my preference is 14/s) you don't need any more haste. After you get there, you just funnel things into crit, and once you're seeing a steady stream of elusive brew procs, you can go into mastery. I was at 14 e/s, but I dropped a bit to get my LFR set helm and chest equipped for my 4 piece. I like the extra guard absorb on the guards thrown out on my raid, so I took a small hit to my haste.
I'm an alchemist, so I tend to use elixirs, as they last 2 hours. I use crit/armor elixirs until I just need the extra bump in health from a stam elixir. I don't tend to use agi ones, but I do keep them around. I'm just partial to the raw crit I get from the mad hozen elixir. Raid buffed, I sit around 35% crit or so, and I'm rather pleased with it.