I think it's kind of hit or miss depending on the hog.
I have one for my hedgie - she uses it sometimes on her own... but at a frequency that leads me to believe she only used it by accident. She goes on her wheel when left to her own devices or peels back her liner and uses a corner or edge when there's no wheel (eg, when she sprained her leg and we had to take out the wheel). We use little wheel mats for under the wheel - smaller pieces of fleece that we take out daily so we don't have to wash her entire liner until a few days pass and she's made a right mess of everything with kibble crumbs and peepee paw prints.
Mostly, we use the litter box with her. Um... poor phrasing... how to describe? When she's out for playtime and she starts making pointy bottom/raised tail, that's when it comes into play. We'll hold her, she gets in the stance to go, and we make sure her rear is "aimed" in such a way that the messies drop into the litter box.
So, yeah, I'd say go ahead and get a litterbox, but you may end up using it a tad differently than intended
