I went through about 5 canopies so far. I live directly on the Erie Canal, so the weather here is crazy at times. I've been through 5 canopies and usually lose them in the canal due to heavy winds. So I bought these for the fifth canopy. (Yes, it took me that long to figure out I should weigh them down! :D ) I have to say, these really helped hold the fifth canopy down during the crazy rainstorms. Too bad that tornado hit! Nope, they won't hold up to a tornado! :D I'd post a pix but they're in the canal now. However, if you are tired of rebuilding or re buying a new canopy, they do help to hold upper end canopies down in normal rainstorms.