I started with Minstrel's then later switched to Harrier's with a few Minstrel trinkets for survivability. It's fine in T4. I think I had half/half at one point. You can mix pieces and experiment. I prefer the boon time and damage Harrier's gives to the extra heals of Minstrel's. Also, Harrier's feels better with a more experienced group, because they don't tend to need much heals and your ~6k DPS helps. Minstrel's feels better when your pug needs to be carried because you can just ignore most mechanics.I've seen HFB run full Harrier's, full Minstrel's, Harrier with Magi trinket, full Diviner's. Even full Plaguedoctor's. It all works up to T4, but with CM's 99/100 you want to be playing whatever meta.