Thanks for the reply Paul, the Monolock* boxes are at Givi's budget end and iirc they term them as being 'single skin', the Monokey's being 'double skin', they are also described by Givi as being 'Suitable for scooters and small motorcycles' and are generally far smaller in size, guess I must be in the minority thinking that it's odd that they include the Gen2 FZ1 in the small bike category, I'm wondering if Givi is infact run by Gen1 owners.
*The lid on my Monolock is very flimsy which apart from feeling shoddy makes the locking locking clip less secure