I got stormherald on my warrior and yes this gives extra res and bit more dps against more stun procs on stormherald.

If u already got stormherald and are not getting many points per week u are much better off getting more vengeful armors rather then saving up for this. (Assuming u dont have full venge) :)

Edit: As for that video posted above.. Any warrior knows how satisfying it is to have sweeping strikes on and do whirlwind with 4-5 enemies around u.. thats like 8-10k for just that one whirlwind.. even more :)