I've been using the Fiberseal version with both a pole and a hand sander. Works great, just as your vid shows. Biggest problem, particularly with larger skims and a sheen paint, is getting no sander screen marks. And then you do end up needing a sponge sander where you can't get the big foot of a hand/pole sander in. But basically, these kind of devises have changed my life.
For large skims, have really dramatically reduced the set up/clean up.
And if you use the waterbucket idea to collect the dust ( needs heavy tweeking) it saves your vac.