We use them and they work great. My friend had them, and then my mom saw them, and decided she needed them. You just need to be sure to dig a little hole into the dirt so it doesn't get clogged, you have to do it on an angle. We change the water in the globe about every 2 weeks. Why not just buy one set and see how you like them? I paid $10 for a pack of 2 from one of those stores that sells a little bit of everything, so it's not that much money.