After two months I can say that these boards worth every penny. With nearly daily use, they are still as good as new. Of course, the boards can not be washed in a dishwasher, for wood or Bambusbrettchen are not appropriate, but that should be understood well by itself. The boards are also used for cutting, not only as a support, so it was important to me to use wood or bamboo to protect the blades of the knives. So far, that has not leave any traces in the boards. Likewise, they also seem to be very insensitive to dirt, nothing has so far may leave stains, not even coffee. Cleaning is also no problem, even sticky or dried residues go well again, there are no splinters or rough spots that interfere, everything is nice and smooth ground.
Overall I am very pleased with these boards, simply a super value for money and a good product.