Yup... all of them use it. They don't keep it near as pretty, always moving it around to where ever they want the aspen, but generally they always use it. Plus, it doesn't get the dust into the babies nostrils like the pellets are prone to doing.
It's not as much as it looks, it's two handfuls of aspen from my tiny hands. They get one deli cup full of equine fresh, then the aspen. At the second changing they go to all pine pellets. Otherwise it's stinky.
Of course, there is always the exception to the rule!