I should probably at least include it in the enchants section, but I'm not sure which classes/specs might actually want 9 haste/crit over the proc. The only one I can think of is maybe fury warrior? Guessing everyone else would prefer straight up damage. The haste might increase the proc rate of elemental force enough to be significant if you're dual wielding it, so maybe survival hunter? I think rogue would still prefer the proc for burst damage.