I think I'd just worry about it going on the fritz...
It's one more layer of technology that can go wrong, need repairing or act erratically.
Add that to the fact it kicks in when it thinks it needs to - I can definitely imagine situations where everything is fine but it interoperates a danger and stops you out of the blue, giving you a right shock and throwing your train of thought out of the window!
Also the fact that tailgaters are a daily occurrence, but are usually safe as everyone is reading the flow of traffic ahead, a sudden brake from a the system misinterpreting something could be costly!
...all these thoughts, although totally unfounded and paranoid, scared me off the feature
Apparently, the system disengages if you dip the clutch, or press the accelerator, and it won't engage at all if you brake as you would do normally. But if you're distracted and someone suddenly slows... it could be quite useful.
I suspect, like ABS and (soon) ESP, this sort of auto braking (AEBS) will be standard and required on all new cars one day. Anything that reduces accidents, no matter how good a driver you may think you are, has to be a good thing?
If the city emergency stop is for a 17 year old which also
does a lot of city driving then I think that the system would be a good thing
to improve safety. I noticed on the VW German website that they have a driver
pack plus which includes the city emergency stop, rear sensors, cruise control
and multifunctional computer for ‚¬590. I don't know why they made the UK
specification different from their specification?