This is a brilliant shoe. The boa system is as good as any other cycling shoe out there, and when combined with the stiff tongue it makes for a very snug, but comfortable fit with no detectable hotspots. The carbon soles are noticeably stiffer than the nylon soles of my previous road shoes, which makes for a very nice spread of the pressure over the foot.When purchasing these shoes, ignore the sizing chart. I wear a 9.5 (american) shoe, and I tried on several different brands of shoe at my local cycling shop. The 43 fit my foot perfectly across the board (shimano, Giro, specialized, etc.) So I went with a 43 on the Louis Garneau LS-100's even though I had not tried them on. They're a perfect fit. My recommendation is to check the sizing chart of a pair of shimanos when trying to convert between American and UK sizes, or otherwise order one size up from the sizing chart listed on the amazon listing for these shoes.I knocked a star off because the LS-100's run just slightly too narrow for my feet and they don't offer a wide option. If you have a somewhat wide foot, you might be happier with the Shimano RP3's or RP5's (I preferred the toebox of the RP5's, but the material of the RP3's.The other reasons I knocked off a star on these shoes are that they don't cup my heel as snugly as a pair of Shimanos, leaving just a tad of room for play (I notice this more when I walk then when I ride); and also the construction is inconsistent between the left and right shoes of the pair that I ordered. The printed scale on the bottom that shows you where to line up your cleats is off by more than a mm on one shoe compared to the other. There is some bubbling on the toebox of the right shoe and the material is not glued to the soles in the same place, leading to slight inconsistency in feel (the right foot feels a bit narrower than the left, however that could also be a difference between my two feet). There is also a place on one shoe where the material doesn't seem to be fixed to the sole as well as on the other. This is an area that always fails on my soccer cleats, so I am a bit worried about the longevity of these not-cheap cycling shoes. I will update if it does fail there.Pictures will be posted below.I always wear a size 44 and went with the reviews and ordered a 44.5. Immediately I knew they were too big, so I re-ordered a size 44 and the fit was perfect. These run very true to size, so I'm leaning towards the opinion that people just don't know what size they wear. These shoes are incredibly comfortable and well-made. However, there are 2 reasons why I sent them back.1) The heel cup was way too loose for my foot. I'm not docking a star for this just because everyone's foot is different, and these just happened to not be suited for my foot.2) What I will dock 1 star for is the retention system. It is super-easy to use, but nowhere near as secure as a ratchet at the top. And the bottom strap does virtually nothing.Again, just not for my feet, but these are great shoes and the bright yellow is BRIGHT!This is my first non-SPD shoes and I'm impressed. I was experiencing hot spots due to the smaller contact area from my Scott Team Boa mountain bike shoes. I'm a road cyclist but liked the ability to walk so that's why I had mountain bike shoes. These are very light and much stiffer than my prior shoes, with the stiff carbon soles and the SPD-SL pedals spreading out the load. Problem solved! No more issues. I love the shoes and highly recommend the Boa laces. The ability to reach down and quickly adjust my shoes while riding is great! After about 10 miles, I back them off slightly as my feet swell. I barely have to slow down. The shoes come with two pairs of inserts: a cool insert that allows air to flow through the bottom of the shoe and across your feet and a hot insert that blocks the airflow on cold days. Really nice feature.Compare these to shoes literally costing hundreds more. These are a great buy.I wear a 9.5/43-43.5 in most bike shoes, I bought a 44.. I am an old time cyclist that use to by leather shoes two to three sizes to small and soak them in water and wear them until they dried to minimize stretch and any sloppiness. The way shoes are now made and they way they fit is much different with the same results. Out of the box these fit perfect. I am disappointed with the QC of LG. The left shoe guide is not in the correct place. This will not effect performance, as best as I can tell; it will just drive me crazy.The quality seems fine, but they're very narrow. I don't have exceptionally wide feet, but cycling shoes seem to run narrow. These are no exception. Some people say to just order a size up, but that increases the length and you'll likely find your heel slipping. Had to send them back.I wear a 10 1/2 shoe and 11 running shoe and the 45.5 fit me perfectly. Solid shoe and I liked the Boa system on cycling shoes. I would buy again and would recommend to a friend.Awesome shoe ... I normally wear a size 9 shoe. I ordered these in a 42 and they were too small. I would advise to go up 1 sizeI own these in black 46. These are 46.5 and perfect. LBS doesn't carry this size. Boa closure seems less complex (secure?) than my black pair, but still, a great carbon for a great price.