I always buy a solid size 12 so choosing an 11.5-12 was a little worrying, although I've had an EU size 45 in the past. They are tight but I think they will stretch a bit. It's only been 3 days but if it's a break then we're off to a good start.
Pros
Very durable and very comfortable.
Cons
Shoes can be non-slip, making them dangerous to wear in wet or slippery conditions.