Purchased this shoe due to its flat bottom, Mountain biking and an occasional DH ride, and am very pleased with the decision.
Sizing: I wear size 10 and the 44 is perfect.
Waterproofness: excellent, water stays out. At the end of a couple of wet rides, everyone else had soaked feet. Also with the cleats attached the shoe worked fine on flat pedals on the downhill bikes.
With this shoe you are able to pedal without being clipped in, and finding the clip is rather easy due to the flat bottom.
The shoe grips very well, better than my Giro or Shimano shoes with lug bottoms.
There is plenty of padding around the shoe and in the tongue. The laces give me a better fit than velcro straps. They are a little heavier, but it is mountain biking. The shoe performs excellent and I will purchase another pair when needed.