FWIW I've been running one since September and haven't touched it, cleaning or otherwise.
I have the beta unit, which has smaller mags than production unit. I ran on a 3/4" tank and had to use algae-mags instead of the included outer mag. However, after RAP we went to a local reefers house and had a production model running on his massive tank with 3/4" glass with no issues. Full power and it did not budge. Initially the outer mag was upside down and it slid around a little, make sure you have them aligned properly and both oriented in the upright position.
Thanks! I'll give it another shot on the 3/4" glass and see if I can get it working.