While I continue to wait for a Mask of the Crackling Energy to drop for me in Anguish, I still keep this around.
Doesn't work very often, especially with the level Runes I now use, but once in awhile it procs and saves me 20pp.
On raids, I cast Legion of Alendar Rk. II and Rune of the Kedge Rk. II on every group. Each cast takes 2 Peridots, so I tend to go through anywhere from 80-100 Peridots a raid. As you can imagine, that adds up mighty quick. So, while "reagents are almost obsolete now" for Clerics, Enchanters are still forced to carry around scads of Peridots. Thank God they now stack in 100s.