Yes, I took the punt without trying them on and am happy. If I had gone with the 43, the big toe on my longer foot would have been painfully pressed against the front of the shoe. I could probably do with one 44 and one 43 or 43.5 but I'm not quite prepared to shell out for that.

Had my first weekend of riding in the Sidi shoes.
~70 km on Saturday
~50 km on Sunday

I'm convinced, they feel great.

One difference I noticed, compared to my all velcro carbon sole Exustar Taiwanese shoes was that towards the end of the Saturday ride my feet felt like they were under quite a lot of pressure in the shoe (in the width). I just clicked them out a bit to give me some more room. I think my feet just naturally expand a bit from the prolonged exertion and my old shoes weren't snug enough to make the difference too noticeable.