No buddy, i took my car to Nissan when i first got the car for a service and check up just to give me piece of mind, I got the car back and I don't think they actually changed my oil, I think they just got a new bottle and threw it around in my engine bay as it was everywhere strut brace, engine cover, brake fluid cover underside of bonnet (how???). So because of this service by a dealership I refuse to use them due to the lack of respect during a service, I wouldn't like leaving my car if a big job came up.
As I am not even thinking about ever selling my Z I take it to my local garage that my family have used for the past 15 years, he is a Japanese car specialist and has had 3 different types of Z and he and his son take pride in working on my car. So because of this it makes me happy that someone decent is working on my car.
I'm not 100% sure on price as I don't have the receipts to hand, I believe around £240 mark which i was happy with considering belts and plugs where changed with the P3 service.