I always liked addons that do this. I never understood why Blizzard didn't have it built into WoW.

Can I request the feature to have a tag on one of the tooltips to tell me what spec/classes are more than likely going to get an effective use out of a piece of equipment please?

That is the only feature that it seems no body is doing with these kind of addons. It would really help make things a little simpler.