As mentioned by illyun they aren't an option on the Gti (£195 Luxury pack 1 on other models)
I have had my car for 1 week and the rain sensor wipers have behaved impeccably, in, drizzle, rain, heavy rain, sleet and hail. (I must have the right type of precipitation round here, and s**te weather!) There is a sensitivity selector on the top of the stalk. Mine is currently set fully left (lowest sensitivity)
I haven't fully evaluated the AHC yet. All I know is:
Auto lights is Automatic headlight control. The criteria for switching them on is based on two factors: low light level or speed above 140km/hr (87mph). The criteria for switching them off is a return to normal light levels or speed dropping below 65km/hr (40 mph) for several minutes.
VW make the Warning statement on page 46 of booklet 3.1
"Never drive with just side lights on. Risk of accident. The side lights are not bright enough to illuminate the road ahead and to ensure that other road users are able to see you. Always use dipped headlights if it is dark or if visibility is poor."
it goes on to state:
"If "automatic headlight control" is switched on, the dipped headlights Will not be switched on in fog. You will have to switch on the dipped headlights using the light switch. The driver is personally responsible for the correct use of lights in all situations. "Auto headlight control" is merely a system to support the driver. In certain situations you will have to switch on the dipped headlights manually using the light switch."
So, if it's dim or your doing 87mph+ they come on. VW obviously feel that the only lights suitable for driving are dipped headlights. I actually expected auto lights to come on in 2 stages, side when dim, then dipped when it gets a bit darker.