Gosh, I have several miso bowls, but I never use them anymore.... Face lathering is the bomb, but YMMV.
Yeah, that's right, you can cram soap into them and use as a loading platform. I'm a fan of containers with a lid, I'm not a fan of dust in my more seldom used soaps(Williams...).I face lather, too. But I use the Miso bowls to load my brush and I do some mixing in the bowl. The bowl works great.
I'm waiting for someone to post a picture of a suribachi bowl. I'm primarily a face latherer, but there is something enticing about those bowls......might make a bowl latherer out of me yet.