I posted about SIDI's recently, so you may have already read my comments on same. I have a very long, but very narrow foot. I have found that SIDI's are good for people with narrow feet, yet that doesn't mean they are bad for people with wide feet. My husband does not have narrow feet and loves his SIDI's. In general, SIDI's seem to be made to sort of mold around your foot, whichever shape it is.

The regular men's shoes were too wide for me, so I tried ordering a women's shoe. But I needed a 44 length and they only sell women's up to 43. So, I opted for the men's narrow. I have such a stupid foot length and width that I couldn't simply go try on a bunch of shoes. Hopefully, you won't have that same problem. I've only warn mine a couple of times and, so far, my right heel seems to be a little too roomy, yet my left is not. I'm still playing around with the right tightening. Over all, they are WAY better than my Shimanos. I have SIDI Genius 5's.