This base is super heavy, so it keeps my extremely top heavy umbrella on the ground (although I haven't tested this on a really breezy day). It's not perfectly balanced, though, so it wobbles quite a bit even on a perfectly flat surface on a non windy day. Also, there is only 1 screw to hold the umbrella in place, so it tilts to the side. 2 or more would hold it straight up. It does the trick, but I think I'll be looking for a new one next summer.