fits perfectly well with the old system holder

The Clip system holds the Galaxy S4 and safe and everything works. Practical is the variable bracket for the fan grille. In a Klitzkleinwagen like an old Corsa B it will not happen because the vents are too tight there, in all reasonably modern vehicles there should be no problems.
The fan also cools the unit, which has indeed developed some heat on the charger during operation.

Had earlier a similar system for the LG Optimus Speed, which was also low (15 euros) and also a battery charger for the 12V-connection was carrying (missing here unfortunately), and was also very happy with it and use the mounting element which further because the bowl, in which the device is clipped, fits to the same holder, which is very convenient. So I have a second holder (eg for the car's girlfriend) and, depending on demand, the LG or Samsung dock with each matching shell.

One point deduction, there is not, but the downside I want to add: type of construction, the shell would slip out of the holder when the "nose" of the holder faces downward; We must therefore ensure that it is when you look at it at all times, not "upside down" spins, because otherwise the whole thing makes the exit. But I personally turn only 90 ° each to the left, if I want to have cross image and 90 ° back to the right when I prefer it upright (standard). Complete rum by 3x 90 ° to the right o. Ä. I do not do, because after no more than 2. Further rotation would namely facing down and go down.

But whoever keeps his unit in the same position, will have no problems, so here is no deduction, but only of the Notice. All more stable and secure than the circular clip holder with TomTom and where no suction cup for windshield is also no (theft friendly) mark on the disc may be and as no suction cup by sunlight can become brittle, lose suction and under heavy braking the device by let fly the space.
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Addendum Feb. 2014:
After six-nine months of "clip to open" is canceled .. its just plastic and to be expected for the price almost. Therefore, a point deduction, but no more than that, because I still have a great and just re-order :-) For under 10 euros which is clear and the system has a total of convinced me.