Bungmeister

Well.....if you really want numbers:

400 haste will let you chain cast 180 CH's in 6 minutes with 0 latency and perfect spamming. Using a 3.5% proc rate, you get 6.3 or 6 procs on average.

With 0 haste, you get 144 CH casts in the same time. Using the same 3.5%, you get 5.04 or 5 procs on average.

So to say that it "works great with haste" is a little overdoing it as 400 haste will on average buy you 1 extra proc. Now is it a useful gem? Well, 6 procs over 6 minutes is 1800 mana? If you're short on 1800 mana, then it's invaluable.

Now going with the 26 healing meta and being overly simplistic, I would assume that you have 4 slots used for orange and purple gems which would be replaced by spinels. So that results in 26+4*11=70 healing you're losing out on. Continuing with the simplistic model, the amount of healing that equates to is approximately 70*1.05(purification)*1.1(t6 bonus)=80healing. Assuming 3 jumps, that's 140 healing. So with 180 casts, that's a possible 14.4k to 25.2k of heals that you can gain by going with BED. (obviously those numbers will go down with downranking as well as possible +healing socket bonus's you're getting)

At the end of the day, it goes back to the individual. It *SEEMS* like the average shaman on these boards boasts of having no mana issues, and if that's really the case, BED is the way to go. If you have mana issues, IED would probably be better for you.

Personally, I use BED. According to Skyhoof's experiment, one can imply that you get an average of 6 procs over 6 minutes making IED 25 mp5. I can easily get more than 25 mp5 by changing my relic,trinkets,cloak,rings, heal ranks etc.