Of all of the cars I have had, the Audi seat heaters are the best.
The heat is evenly spread and the thermostat makes sure that you are in full control.
You can set it on 6 for a few minutes to warm you up but then reduce it to 2 or so and it keeps it warm without being uncomfortable.
I even leave it on constantly at 1 on cold but not freezing days and you don't even notice it apart the fact that you are comfortable!!
One slight tip though, I switch them to zero before starting the car on icy mornings just to give the starter as much power as possible (even if the car disconnects them automatically when you turn the key)
and if you are ever playing with VCDS (and therefore have the ignition on for a long time) be careful or you will flatten the battery (as I did recently) mainly because both seat heaters were on.
Steve B