As much as I love anal play and the toys that make it enjoyable... I'm not a fan of anal beads. They're often rather small, or at least the silicone ones tend to be, and I prefer anal plugs for the filling sensation or dildos for the thrusting motions.
Beads are just too much work for what they are, but that's my opinion. I'm sure they have their merits, but I have other types of toys I much prefer.