Upgraded from a very old pair of Sidi Genius 5 - - the Alba 2 is a big improvement!! Sizing is consistent with my other Sidi shoes, and these fit great, very comfortable, with lots of room in the toe box area to fit my wide feet (and bunions, ugh!), but would probably be fine for a narrower foot as well, since there's a lot of adjustability with the 3 straps. The Sidi "Boa" device is a little different from other Boa fasteners, and the printed instructions were useless, but one of the guys at my bike shop explained to me how it works, and it's very easy. Also like the "bling-y" silver/reflective pad around the heel, which is both functional and very decorative! Great combination with the Speedplay Easy-Tension cleat, which is actually quite walkable, and like the fact that Sidis have a replaceable heel plate, so the shoes will last longer.
Bought these to replace my well-worn Sidi Women's Genius 5, and have them set up with Speedplay Easy Tension Cleats (for Speedplay Zero pedals). I have a normal/average heel but need a wide toe box (due to bunions), and these shoes are very supple, adjustable and comfortable - - as well as very attractive (for a cycling shoe!). The ankle area and front strap have a glittery finish, which I assume is reflective, to improve visibility in the dark (and a great idea!) but is also a decorative and fun touch. I ordered the same size (38, which equates to a U.S. women's size 6.5) as my older Sidis and the fit is absolutely perfect. My only complaint (a minor one) is that the printed instructions for loosening/tightening the "boa" style release were difficult to understand, and apparently the "boa" on Sidis operates a little differently from those on other brands, but one of the guys at my local bike shop showed me how to work them and it's very easy (and they work great!). Really can't go wrong with Sidi shoes!!