Been treehealing with Omen of Clarity for a long time, it's okay in fivemans, forget about it in raids, and for five druids you'd have to position them in melee (you get nobel prizes for that) and smash until it procs.

If it's just for one resto amongst four balance you can obviously go for it. I feel that makeup will work pretty well after target managment issues are taken care of (and once gear and talents have reached the level where no beartank emergencies are required).