As soon as you unpack it, you notice the solid workmanship and the low weight of only around 65 grams. The Osmo P3 is simply inserted via a side buckle and is then absolutely tight. Particularly positive: 

All ports and controls remain accessible, even when accessories such as the battery grip are attached.

The real highlight is the magnetic attachment. The total of 17 N52 magnets ensure an extremely strong grip on almost all metal surfaces. Whether on a lamp post, car roof, radiator or steel cabinet, the camera sits securely and wobble-free. If you want to film on non-magnetic surfaces, you will find two metal rings included, which can probably be glued on as an adhesive base. Unfortunately, the enclosed (English) instructions barely address this point, which is a small downside.

Thanks to the numerous 1/4-inch threads and the cold-shoe interface, the holder can be flexibly extended, e.g. with a light or microphone. 
In combination with the wide range of adjustment options (360° horizontal, 180° vertical, additional 270° inclination), there are many creative applications:
from vlogging to time-lapse, from POV setup to desk recording.

My personal conclusion:

A well-thought-out and sturdy accessory for all Osmo Pocket 3 users who want to get more out of their camera. The magnetic force is impressive, the handling is convenient, the expansion options are versatile!
Very clear recommendation!