Bought New back around 1993 or so, shortly after it was introduced. Although after 20+ years, its Zoom mechanism will get stuck when it has set around, it still functions fine a moment later and fulfills a need in my arsenal. USM is flawless. It was an exciting range back then, but modern optics far surpass it in that respect. I first saw this at a major trade show in Wash DC and was drawn by the 20mm WA, USM and somewhat by the 77 mm Filter size, which has been a plus for me. Sharpness rated higher than the Pro 2.8 version of that time period. Vignetting can be slightly noticed, but has never distracted form my images. In the digital world of Lightroom, it is negligible. It was around $500 New and has proven a great investment. I love using this lens!