Stable - yes. But large. Really big.

Quite so huge I had the support not imagined, but it does what it should.
Bonds bombproof on the disc once you have turned over the lever. Larger implements them securely fixed, but you do then the pictures / videos to bat upside down, because the tripod socket on inclined slices unfortunately can only screw from the top into the camera. By turning the holder namely, the camera comes inevitably to the disc, and it does not remain enough space above the holder. You can rebuild him not, because then the adjustment no longer considers reasonable.
Ideally, therefore, can be adjusted on the camera image alignment; I use the example Rollei S-50 WiFi Ski Edition Action Camcorder (14 megapixels, Full HD video resolution, 1080p) Black with this holder as Dashboardkamera. The Rollei then hangs upside down in the car, but the image is already rotated by software to 180 ° when shooting, and then it fits again.
If the disc still steep or vertical, everything works again excellent, and you can even stick a larger system camera from inside permanently to the window pane.

Conclusion:
Great, good, cheap. And holds.