I have used them twice in the past myself mate.
Once for the steering lock recall with no issues there -It was all fixed whilst I waited around 50 minutes by memory.
The courtesy car on both occasions was a Micra went was pretty grim-almost any of the other car range would of been a step up!
And for a service on the 2nd visit. Service was fine but just well over priced so have been using SRD since then who offer more than Nissan do in their service and for half the price! SRD Tuning - Supra, GTR and Performance Cars Customisation