kelly wattell wrote a review of Giro Sica Shoes - Women's on April 16, 2013
Familiarity: I've used it once or twice and have initial impressions
This is a super lightweight shoe, very comfortable and stiff sole. I am happy that I got this shoe for the upcoming race season, but I will also keep my old shoes around for normal riding. I am not impressed with the "traction lugs" (tread). I've used the shoe twice- once for a practice ride and once for a race. The race did include a very steep 20 minute walk up a hill and now two front tread teeth are pretty much worn through. For the price of the shoe, I would expect the tread to last longer than two rides.
Also, the sizing is wack. I recommend trying on a Giro shoe in person, before buying online. As someone else also mentioned, I'm a 7.5 and normally a 39 for cycling shoes, but had to go all the way up to 40 for these, but I have a bit of wiggle room (which I like for MTB shoes, so I can fit a toe warmer).
Value for money? Eh... I feel like I'm going to have to buy a new pair of shoes in a few months or just continue to use my old ones. I'll keep these for racing only, since they don't seem like they'll survive the 3-4 days of normal riding that I do per week. Recommendation to Giro- if you're going to make a shoe with such a poor tread, then please make the tread replaceable like Sidi.