I bought the shoes for windsurfing. But they were perfect. I found they were good, have not scrubbed at some point, they have kept my feet quite well warm (but the water also was not very cold), I could well stand on the board and have not slipped.
As for the shoe size, I often vacillate between Gr. 39 and 40, here I ordered 39 and they have super fit.
For surfing so I can absolutely recommend the shoes.