I have the RX-V3800, and added presence speakers a few weeks ago. I happened to have a pair of Mirage Omnisat v2 sats on hand, so I figured I might as well make use of them.
As you can see in the photo, they're not placed as Yamaha suggests, but I find them fine where they are.
For movies that have lots of surround effects, I use the rear surrounds. For movies that aren't heavy with surround effects, I switch to presence.
For the music soundfields, they can also add to the experience of "being there".
Used with discretion, they're a nice option to have.