As described in other reviews, the holder sits absolutely firmly to the windshield. The lever for locking the device to be secured, even if something hakelig, I find also park matic as some spring mechanism. The only weak point is that heavier equipment, such as my 7 inch Tablet vibrate slightly, with some rough road. I have the following remedial action by I clamped my smartphone cover between the holder and the dashboard. Thus, the somewhat disturbing vibrations transmitted are eliminated. The lighter smartphone seat against vibration. The price - performance ratio is certainly not objectionable.
