Switched to VX6 after Zeiss' flop with the 5HD line, which had poor low light performance and was such a weak performer that the resale value dropped like a rock. I essentially got stuck with a weak performing, low value scope......costly mistake. The VX6 has tracked perfectly, glass is very good, customer service is solid (always pick up the phone), warranty I hear is top notch, and accessories (like screw in caps) are a huge plus. I do hear good things about the V-6 line now too, but remain skeptical until further proven.