Once the product in hand, I have a feeling very average.
Directorate my car. Pretty simple assembly, despite the total absence of instructions. Being accustomed to these systems I put the cup and the blocks with the dedicated lever. That sounds to hold.
After 5 min, everything falls on my dashboard. Result: Support broken. I'm lucky that my new Galaxy S3 is not broken in the process.
I could try to fix it with glue, but I have certainly seen that it's broken about that blocks mobile and above all I trust at all in support to leave my mobile.
I have not had time to test the installation on ventilation grate who seems 'classic'
Note also the charger with a twisted wire of a length too short for any cigarette lighter at the gearshift.
In contrast, very good response from the seller.