Kris and I have these in RHD. One holder is useful for drinks only. The un-usable holder is just greaaat for mobile phones and IPods, as they sit in the dark cave under the climate control sliders, so you can see them light up.
Definately good for holding cups solidly though. No troubles.
Works in 5-speed manual and auto. Not sure about six speed manual in RHD, proly okay for LHD though.
I suspect that they won't work very well with M5 surrounds, so it probbaly isn't M5 compatible.