Primarly, I am noticing that the value of haste diminishes to the point where it is no longer beneficial to gem for haste but rather switch to gemming for agi. This kind of makes sense to me after playing around with the set bonus as combat for a while. During AR+SB and gemmed for full haste I was unable to dump my energy quickly enough and was hovering around 90-100 energy for most of the duration.
If I do gem for haste, I notice that the value of haste drops below mastery and it becomes more beneficial to reforge for mastery. So there seem to be two paths. 1: Gem for agi and reforge for haste. 2: Gem for haste and reforge for mastery.
As a side note, the novelty of a 0.5 sec gcd diminishes quickly and becomes pretty annoying. It does not leave very much room for thought; just spamming SS and throwing evis in there before capping combo points.
Also if any folks whom are affiliated with Shadowcraft; it seems to be having trouble reforging for combat with the 4 piece bonus. Whenever I try to do so the reforge simply stalls and gives nothing back. I am not sure what is causing the issue. I have to copy down the stat weights and do the reforging using WoW Reforge. Here is a link to my shadowcraft page if anyone is interested in this problem.