I am a shadow Priest. I have the complete frozen set. This set is T4 T5 Equiv. However, the score you give for these items are very low. As a person that has the T4 gloves, Helm, Shoulders I can tell you that the Frozen items are far better then the T4 as such I would never wear them over my Frozen.
Please review or explain why this set is not given its proper respect.