Originally Posted by
Seriv
It depends on your mastery amount and RoW version. Apart from moving, increasing ToF uptime or when you just want more orbs (like for Searing Insanity, self heal or target switch) it becomes not worth to use it if 7 MSp deal more damage than 3 SWD, 1 DP and 3 Insanity GCDs.
(3 * SWD * CoP + DP) / (7 * MSp * CoP * RoW - 3 * Ins * RoW)
= (3 * 2.7 * 1.4 + 5.808) / (7 * 1 * 1.4 * RoW - 3 * 1.584 * RoW)
=
720 RoW (1.4925): 2.276 -> 3613 Mastery
726 RoW (1.5205): 2.234 -> 3466 Mastery
735 RoW (1.5660): 2.169 -> 3237 Mastery
741 RoW (1.5985): 2.125 -> 3082 Mastery
751 RoW (1.6575): 2.049 -> 2816 Mastery
Even though those numbers seem quite high (especially when going for 2600 haste first) one should not forget the mastery raid buff and the mastery weapon enchant.