I use one of these, or an older and half price model that looks just like it:
Telefonhållare UNISYNK | Clas OhlsonThe mounting thing broke long ago though, in my old car and the sticky stuff was useless. Its been with me like 5+ years. I have it secured to one of the vents with two zip ties. It is very adaptable for different sized phones and does not have any problem with extra cases etc.
Because it is fastned with zip ties in the vent its not perfectly stable tough and a little to spirited turn will have it move the vent grill and thus its own angle too.
I have been meaning to replace it because of this last issue, even if it only takes about 2 seconds to right it up again by adjusting the air vent blow direction, but thus far have not been bothered enough to do so. I do use it daily, I have the torque app running during my commuting, if I felt there was any serious issues with it I bet it would be replaced long ago.