Vision Quest also gives me 32 mana regen, but BR not only requires no work/primary at all, but gives me a lot of life regen as well. I use both BR and VQ though for ubers or high MPs; an easy +65 mana regen, which is huge.
To compare, Spiritual Attunement gives 9 mana regen and some doesn't-really-help max mana. I used to use SA all the time too, had no idea how !@#$ty it was.