The 0550, like most of the other ZT models, has a hefty, overbuilt tank-like feel. That said, it's actually feels pretty lightweight relative to its overall size. The S35VN takes and holds a great edge (couldn't really notice any difference compared to S30V or D2). I made a spiral cut ribbon out of a tin can, and other than a couple of small rolled spots (easily steeled out), there was no appreciable wear on the blade (other than marking up the DLC something fierce). It is a very smooth opening/closing knife once you figure out the trick to it, and it has good overall ergonomics.
The only thing I didn't like was the bulk. It is not a small knife (nor was it meant to be). I found it to be okay for back pocket carry, but when it was sharing space with my keys and wallet in my front pocket, it was a bit overcrowded. This is really more a matter of personal preference though. If the bulk doesn't bother you, it is a pretty awesome knife to EDC.