When the mounting plate has been fixed correctly you then need to detach the TomTom GO arm from the original windscreen suction mount and screw it into the Brodit mount.
There is a slight problem with the power connector, see below in Issues and problems for more details.
The Tilt and Swivel mounting plates allow a certain amount of horizontal and vertical adjustment, coupled with the additional movement offered by the TomTom Go arm itself.
The picture to the right shows the fully assembled mount.
One of the good points about this design is that if you need to revert to the TomTom GO original mount it is a simple matter of unscrewing the arm and replacing it in the windscreen mount. You can then fit it into another car. Literally a two minute job.
I have not used the mount extensively so a long term appraisal is not available yet, but I did have a good drive around and had no problems.
In fact I deliberately selected some routes with sleeping policemen, some rough roads, and some fast roads. The mount seemed as stable as the original TomTom GO windscreen mount, but the position was far superior. That said there is some vibration, it is not as stable as a Brodit PDA mount. This is due to the design of the connecting arm. The stability will also be determined to a certain extent by the clip you are using so it will change from car to car.
Although the driving I did was in somewhat inclement weather where there would be little or no chance of reflections the position of the mount is such that these would be reduced.