I laid out a 9-hole course at my church using these as targets. (There are alternate pin positions on 6 holes, and the flow allows several hole to be combined, so effectively, we have "red" and a "white" courses.)
The course sees a lot of use because kids as young as kindergarten age can (and do!) get them out and set them up by themselves and put them away when they're done. (I installed 1' long 1" PVC pipe "ground sleeves" that they can simply drop the pole into instead of having to pound them into the ground.) Sometimes they'll only set up 2 or 3, but even just throwing back and forth between a couple of targets is better than nothing. (Heck, if I'm going to be at church for choir or a meeting, I'll sometimes go early/stay late and set up a couple of targets and work on upshots and putting.)
A lot of parents have told me their kids have made targets to practice on at home. It's a darn cheap way to get kids (and parents) hooked on disc golf.