Works for us!  We couldn't use it in all of the areas we intended, because we learned that our neighbors have pavers that back right up against the fence.  The concrete base for their pavers is underground on our side somehow.  But, we still use it in some areas and it's helpful.   I'd suggest sticking something in the ground before you spend the $ just to make sure there's nothing underground that would prevent you from being able to use these.