This was inexpensive and did what it was supposed to do. However.

The "invisible" brackets are correctly described in that they can't be seen, but they also aren't a stout enough connection to hold the shelves in place without wobbling. So we had to add a small "L" shaped bracket under the wobbly corner of each shelf and they worked fine.

So, the shelves get three stars - a good value, they look fine in place but the brackets are not sufficiently sturdy to do the job, solo.