On the slim chance that anyone else has got one...
It's perfect apart from the fact that most times I hold down the shift key I get the menu that's accessed from the 'pencil' key on the n-gage.
This is driving me batty (it's remarkably difficult to try to train oneself out of using the shift key while the problem keeps occurring, and I can't touch-type properly because I have to keep stopping to press the 'cancel' key on the n-gage). I can't find any reference to the problem on the internet.