Reusable stickers? Eh.
In theory, they're brilliant. They're usually made of a thin plastic that clings, not sticks, to the plastic-coated play surface that's provided. So, unlike the foam stickers that we have a ridiculous amount of, you can pick these up and put them back, put them on top of each other, and then put them away and play again later.
In theory.
In fact, there are usually some things keeping this from being a really satisfying creative experience, or a really successful toy. For one thing, there's rarely a storage system in place for the stickers. So you take all the stickers off of their sticker page (which it's impossible to return them to--too fiddly) and put them all on the playset--

--and when you're done, then what? If you leave them on the playset, then you can never start your play with a clean canvas, and that hinders your creativity. If you take them off, you might as well kiss them goodbye while you're at it, because how are you ever going to find them again?
I'm also not in love with the concept of the playset at all, and the scene that inevitably comes with the stickers. You're supposed to pose the dinosaurs on their Jurassic landscape, I get that, but what if you want to do something else? Have them marching single file over a rainbow (this scenario gets played out often at our house)? Buying groceries at the Supercenter? Forget about it.
I do think that I have solutions for both of these problems, but I'll have to see if it's worth it to actually make them come to life, since reusable stickers are also prone to getting filthy and ripped as well as lost.
The idea that I'm more excited about is a plan that I have to make some reusable creative surfaces to use with regular stickers. And that's in the queu after numbered beanbags (because Sydney is still struggling with number identification) and one Tooth Fairy pillow.
A Tooth Fairy pillow! Willow's loose tooth is both awesome and gross, all at the same time. Of course, that's how I feel about almost everything involving my kids, so do with that what you will.