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My roadie mates reckon they're winners and I'll feel the stiffness difference
Your roadie mates are wrong. If you have soft shoes, you'll probably feel the larger platform area as a less concentrated pressure, and if you tend to roll your feet (pronate/supinate) while pedalling you might like the wider support which mitigates that. If your pedals aren't bothering you, you don't have to change just to please some Freds :-)
Another pedal related question, do I want to use road pedals? My roadie mates reckon they're winners and I'll feel the stiffness difference, but after getting some bargain FIzik R3s which are fantastically comfortable and light, I realised that the ability to walk is not one of the many features. Or should I just go for some Giro Republic or similar and enjoy not looking like Bambi?