I got a set of Kumho (255/55/18) STX's about a month and a half ago. They replaced my Pirelli Scorpion zero's. I like them a lot. Their handling is very neutral. They don't seem to track in tire ruts as bad as my zero's did. I don't think they have quite the dry traction that the zero's had, or maybe it's that they start to squeal as they reach the edge of adhesion. The zero's would stay quiet, right up to when they let go. The height/width ratio on the STX's are a little shorter/wider than the similarly sized zero's, giving the VX an awesome look. And let's not forget a very compelling reason for purchase... they were over $150 cheaper a set than the scorpion's.