I just got them last Friday so I haven't got to do alot of riding in them but they are outstanding so far. The perforations flow a TON of air once you are moving down the road. These boots would be great for anyone who rides in 80 deg + weather. The adjustable calf system is another great feature it allows you to tighten them up if you are wearing them under jeans, and loosen them if you are tucking sport pants into them.
The sizing is a little strange, I wear a size 10.5 - 11 shoe, and according to Sidi's sizing chart that puts me in a 45. I tried on a 45, and they felt too big so I tried the 44 they are a little tight in the toe area (not painful or anything) but the rest of the boot feels perfect. I would defineatly recomend trying on some Sidi's before you purchase them.
They look awesome too
I will post some pics later.