I bought the 17-piece PRO set to replace my old PRO-S set! The new set has a nice variety of knives. I am very pleased with my purchase. If I could change one thing, it would be the block. There is NOTHING wrong with the one that comes with the set, but when I bought the knives  I also bought two Zwilling acacia blocks that look identical to the one in the set (just a different color). Why? Expansion room! I already bought the 10" slicing knife:)