This used to be my favorite lens. At the f/2.8 end it was super-crisp and could focus within a foot and a half of my subject. But it’s a paperweight now. Because I was moving too fast and didn’t check to make sure my camera was secured on my tripod. I walked away. It fell off. The lens snapped in two.
Canon no longer repairs the 28-70mm because it was replaced by the 24-70mm a few years ago. Which means I have a $1,200 paperweight. So a word to all you photographers, amateur and pro: slow down and be sure your gear is secured when you walk away.