I have been wearing Sidi shoes since the 90's (I still have a pair from 2003) I wear a 38.5 or 39 and have a fairly narrow foot'these are perfect! I also like that a there are replacement parts and they are women specific shoes. This particular shoe is a little more relaxed than my race specific Sidi's and I wear them for long training rides and on my fixed gear Duende Pegoretti made and painted by the master himself, Dario Pegoretti. I'm a Sidi customer thru and thru.
I bought these for my wife since she started indoor cycling and occasionally road cycling. She is barely starting cycling and the fit is great, with the necessary adjustability. They feel very snug without excessive pressure. Breathable enough for indoor and outdoor. Carbon platform transfers power efficiently. Weight is low. Easy to clean. There are some more expensive options, but if you don't want to spend a lot of money but still want good performance and comfort shoes, these are a great pair of shoes to consider. I don't think of any downside.
