Originally Posted by
B L A D E
You should go look up the WW spreadsheet for 6.1 by Rotund.
It has some really interesting information. According to his research, Haste is actually better than Multistrike even singletarget.
Now, it's a known fact that Haste is two times better than Multistrike when it comes to Cleave/AoE with ChiEx/Ascension.
However, according to Rotunds research, Haste is actually still outscaling multistrike, it's only slightly dependable on your Haste rating but if you take a close look.
By using Ascension/Serenity, at 2970 haste rating is when both Haste and Multistrike becomes equal, from there on Multistrike outscales Haste, that's a lot of Haste needed for Multistrike to be very good.
For ChiBrew/Serenity, it's at a 1665 haste rating that they both become equal. It's some extremely high ratings for Multistrike to be equal to Haste on singletarget.
Now, I haven't heard any confirmations about what Rotund has posted is absolutely true but I haven't seen any multistrike ratings against it. I think it's a matter of testing out, i've personally seen a DPS increase in both single and cleave by going Haste enchants/gems with frostwolf enchant on my monk.
I think the theory is that since BRF gear contains so much Multistrike compared to Haste, you will be loosing out on the needed Haste to cast more spells. So I personally believe the best choice is to balance out both Haste and Multistrike while keeping Haste above your MS.