I've just received these in a 41 and I don't know whether to swap for a 40 (DM says the former is 7 and the latter is 6.5).
I'm usually 6.5 or 7 depending on brand but these look pretty clunky on, and my feet are definitely moving around in them a bit. If a 40 is likely to give a bit with wear, then I think they'd be better. Has anyone found this style has relaxed/given over time?