Completely (and surprisingly) satisfied. I needed something that wasn't too expensive but comparable to Nikkor. This good. I use it on D5000, D5100 and D5200. Each of them produces excellent low-light images. It was delivered in record time on Wednesday and used at a football game on Thursday night. 2.8 and a shutter speed of 250 gave an excellent image for a low-light stadium. I wasn't in the field. I was in the grandstand in the 2nd row. THANK YOU Sigma. You've come a long way! Updated 11/25/17. He stopped working. I'll be working with Revain to see what to do next. The motor does not focus the lens on the subject.