I bought this so that I could attach my Tom Tom to the dash, rather than to the screen. When you first look at it, it seems excellent - sturdy and secure, and because of its long goose neck, it can be positioned at almost any angle.
The trouble starts when you try to use it. Whether attached to the dash or the screen, the shaking is so extreme that you can't use your Tom Tom. Everyone who was in my car was laughing hysterically (not the effect I had wanted!) at how the Tom Tom was shaking.
This mount is basically not fit for purpose. Ah well - back to the drawing board!