I use pellets out in the middle of my mare’s dry lot pen. Very evident wetness from pee vs wetness from rain. Her highness requires a bed and it prevents hock sores and I like not having to constantly clean pee off her legs from her peeing on hard ground so have found them very useful…even with NO roof.
A lot of the year, shavings just aren’t practical due to the wind and the BO won’t allow sand.
Susan