The one that I used to have would keep opening with its metal rods bent the wrong way, and so it'd be concave instead of convex. So I got rid of that one. The one I bought yesterday was really cheap, and I expected to only have it for like a month or two, so I'd get a good value out of it - but the strings attaching the fabric to the ends of the metal rods broke off of a few of 'em, so it became useless.
So I bought my third one today, one of the most expensive in the student store, and non-retractable as well (with this fancy wooden handle), and it probably won't break. ...I'll probably lose it, instead.
What do you do with products you don't want to expressly throw out since they might be of value to the less fortunate, but you don't want to give them to the Goodwill or Salvation Army because they're sorta busted? I just placed mine (both of 'em) on this rock in the student center - if someone picks it up and wants to use it despite the fact that it's busted, great! If they don't and they throw it out instead, at least it wasn't me doing it. I wouldn't really call this littering, would you?