We use these with the drape clips Stairville Holdon Mini Clip WH, they are a quick way to attach a reliable fixing to a drape that needs to be hung quickly, the elastic fixing easily goes round truss cords, scaff bars and the hook is useful as well.
Other uses are for marketing posters on exhibition stands built of deco truss if you build a picture frame type truss and have a poster with eyelets made up to fit within then the elastic ties work really well and look good if you get the right colours.
We have not had any failures and have been using them for at least 10 years