It seems like the cloak is popular with all who care to post here.
It also seems I am in the minority on destroying it. I like to build spellbooks with two fairly equal sources of damage so that if one gets stymied I can switch to the other. In a perfect world I would destroy every piece of equipment my opponent played, but since we don't live in my perfect equipment destroying fantasy land I try to play around equipment first, destroy second, much to my chagrin.