WotLK Frost DK and Unholy DK in a Raid - Talent question

[essence]

So I was with my guild ICC 25 and we had a Frost DK and i was Unholy DK. The question is doesnt it became worthless to have the talent Icy Talons when the Frost DK gives the 20% attack speed aura?

[Beanlord]

20% extra haste is worthless?

[essence]

So I have 20% extra haste from the Frost DK Aura and 20% extra haste from Icy Talons as Unholy DK ?

[Raenel]

If your question is whether the 20% Haste that you gain from the 5/5 Icy Talons talent, where you gain 20% haste from casting Icy Touch stacks with the Additional 20% Haste from another DK who has specced into the Improved Icy Talons talent, which is a raid wide buff;

The answer is Yes.
Your own Icy talons, which you gain from casting Icy Touch, will stack with the Raid Buff from another DK, afaik.