These are great for outdoors!  You don't have use disposable cups, and people feel like they are more at home with a real glass.  One note.  They will tip more easily because the base is narrower than the top.  Not a good thing if you have young children.  I am in the "empty nest" category, so this doesn't apply to me.  Dishwasher safe, with no spots or residue.  For inexpensive glasses in great colors, I would highly recommend them.