Guess it comes down to the colour and the stock that is already in the UK as to the actual delivery date. Nissan got thier fingers burned in the recession 6 years ago with a field full of cars they couldn't sell so most things are to order nowerdays
As long as it opens and closes fully that is the main thing.
Roadster's roofs can be a bit of a problem. I had a couple of teething problems with my old 350z roadster.