Cue much staring into shop windows and being clueless. Eventually, returned to Argos, and picked an alternative.
So far, I'm not keen. It's huge, the chronograph facilities don't appear to work quite how they're supposed to (don't you love non-model-specific instructions?), and there was a sticky label on the back of the case that didn't want to come off.
I hope I'll get used to it. If I end up hating it, at least I can console myself that I tried to pick something else.