Currently I'm 63, will be 64 tonight, I've cleared HF, but still find BF to be very useful for grinding XP. I'll go do quests when I'm tired of BF, and when I'm really tired of BF I'll go do collection quests. I think there's going to be useful grinding XP in BF until 65 at least, also, I'm leaving quests for post 70 epic mount cash.