I grabbed this with long term in mind for as the boys grow and inevitably get more homework as they struggle to sit still at a desk to complete tasks (and are often found standing in the classroom). So far the boys both love that you can genuinely wriggle and wiggle on the stool and i love that it's also helping activate the core. Think i might buy a second one in the future so both boys have one for a desk and avoid having to share. Glad they both find it calming.
I didn't register there was an adjustable version. Wasn't on my radar. So probably would have bought that version first, but the larger one (non adjustable) is still great and i even like to sit on it.