Back in the day, I had a Watts Dust Bug, and a Bib Groov-Kleen which was similar, but with carbon fibre bristles rather than stiff nylon. Both worked, but they both had a roller that picked up the dust that was stirred up by the front brush.
The Dust Bug worked well, but was a very heavy tracker, and bypassed the suspension on bouncy-bouncy decks, so only worked on rigid turntables that had high-torque motors like the Garrard 401 or some of the DD tirntables of the era. Useless on belt drives.
One problem was that the stiff bristles played the grooves, and that created pre-echo which added to coloration.
The Groov-Kleen had a counterweight that reduced the tracking weight, making it more suitable for lower torque turntables, but the softer bristles didn't stir the dirt up so much, nor played the grooves so noticeably, and seemed to discharge static quite well.
This German unit doesn't have a roller, so I can't see it picking up much fluff, nor be stiff enough to stir the dirt around. It's probably OK at discharging static if the arm tube is earthed.
As Watchnerd said above, I can't see it being any better than a hand-held brush, in fact, I can't see it being as good except possibly for discharging static if that's a problem.
S.