So I will admit that I upgraded from a very cheap set of knives, but the Zwilling Pro set is amazing.  Pay attention to the branding with J.A. Henkels - "Zwilling" are forged in Germany, where the "International" sets are made elsewhere and are of lower quality.  Obviously very sharp (any high-end knife should be), but the construction here is clearly exceptional.  Substantial feel in the hand when compared to cheaper knives.  In particular, I love the way the blade blends smoothly into the tang - a great design feature that makes for a very comfortable grip in various situations.
I have yet to see how they hold up with time, but the first impression is excellent.  Keep in mind that you need to be a bit more careful with quality knives (do NOT put them in the dishwasher or let them soak in the sink). 
We are very happy to own this wonderful set!