The mounting at my "old sucker", in which by means of two jaws zusammpressbarer the phone is fixed, I like it much better. This solution, however, is probably the XPERIA Z not applicable (volume rocker).
Since the mobile phone is quite hot when navigating - especially in southern regions - the solution seems to me with the air vents to be useful (but I could not test). Unfortunately, however, participates in this type of installation (as opposed to the suction cup), the viewing angle dependence of the XPERIA Z, by the unfavorable angle to the driver, unfavorable. Also I noticed frequent reflections on the display.
As you can see, the holder is not necessarily the optimum. I'll be watching the market, therefore, continue.