In my opinion, the CM gear looks very good and the art team really made an amazing job with it. I think it would be a good thing if blizzard made the Challenge mode gear available for all classes if you unlocked it on 1 class.
There are people like me that rerolled to another class (Druid in my case) and they can hardly make any use of their challenge mode gear anymore.
What do you think about it? Obviously keep it unobtainable but make it available to all classes for those who earned it? So since I have it on my DK I’d also get it on my druid?