I picked up this ring in the 120 BCD 39t size to replace my worn out XX stock ring back in early January. On my first ride I felt a dramatic change in better shifting. The feed ramps are better quality and more numerous allowing faster more accurate gear changes. The ring is a higher grade aluminum with better longevity and doesn't flex at all when shifting under load. As soon as my small ring wears out I'll be replacing it with the 26t 80 BCD ring. In this case due to killer pricing the value far exceeds the small price in quality.