Very nice shoe. Wanted Fizik shoes for a long time so I finally popped for them. I am a long time Sidi person and just wanted to make a switch. Wear 43.5 in Sidi and ordered 43 Fizik, length seemed identical. Problem was this: narrow in the forefoot area and toe area was restrictive. Boa closure is fine, the way the shoe wraps around is nice, no bite, just secure. Very stiff sole. I am 57 and as we age the old feet spread out - I always had narrow feet, not any more. So if you're narrow and don't need a lot of room for toes, perfect. I say true to size, but run narrow. I will say, CompCyclist was a life saver in letting me return them after riding in them, 30 day fit guarantee. That's worth a lot in my book.

I am 66 year old, 5'5", 138 pounds and riding high end road bikes for 40+ years. Preference is more for climbing. I am not a Clydesdale. I needed new road shoes. I usually wear a size 42 road shoe, 42 running shoe or size 9 in Nike and Mizuno. Dress shoes are usually size 8.5 and often narrow. My instep is low and high arches. I opted for Fizik R1 Infinito because of:
1) narrow last
2) Boa closure system
I have used these for about 8 rides from 20-45 miles each. Overall the impressions are these are a very good riding shoe. More specifically for fit and feel:
*very light weight (plenty of web sites to discuss weight weeny stuff)
*Boa system works very well: figure 8 front Boa closure creates glove like fit and no pressure points
*Top Boa is equally comfortable
*High quality upper and carbon fiber sole
*Extremely stiff sole but comfortable because of "glove like" upper
*I selected a 41.5 size and this is perfect; a 42 would have been too large
*Toe box height is more than adequate
The Ride:
*Similar to light weight wheels, light shoes assist with quick "spin up" and acceleration; R1 Infinito are great
*Smoothness of the pedal stroke is very noticeable; likely because of the glove fit without any pressure points, combined with stiff sole
*Since climbing is my preference, I am pleased to report these are excellent climbing shoes
*Energy transfer is extremely efficient
Side notes:
The factory insole is nice quality but did not work for my high arch and low instep. I replaced with Superfeet Green insole (as with all my athletic shoes). The combination of the Boa system, the upper shoe design and the Superfeet create a long distance comfort with high performance paybacks.