Enabling Pilot Assist and Adaptive Cruise Control

[Dougray]

I used the configurator preset to enable pilot assist/ACC last night, then did a 100 mile drive on A roads, followed by a little motorway diving today. It all seems to work fine, so the Orbit preset has done a great job of automatically identifying the correct parameters for my car.
Quite impressed so-far. I only really wanted ACC, but the corner speed assist function has actually been surprisingly effective when using ACC on windy roads. 
Pilot assist works well enough on the motorway, but I don't think I would trust it on anything but the most clearly marked A roads. It would quite easily lose track of the road, put me further to one side than desirable, switch lanes, or even fail to corner, when the road markings were a bit worn out. 
What other people have said about it only being useful for motorways is probably accurate. I am glad to know this now, as had considered paying Volvo to enable it. I don't think it is worth the ~£1000 they would have wanted, especially given they do not offer ACC only.