Time will tell how long they last but so far, so good! Fit perfectly on my QC25s. Some people say they are firmer than originals but when your old pads need replacing, of course they are going to be softer than brand new ones. Fiddly to get on at first, but once you get the hang of it, it's easy. Just google instructions. For $10.95 and free shipping, my headphones as good as new again. Great deal! Especiialy when official Bose pads retail for around $40.