I have several Perky Pet feeders, this is my favorite because you can see the hummingbirds up close! It attaches to your window with a suction cup. Easy to clean and fill. The only down side is the little levers on the back you squeeze together to detach the top from the bottom are a little fragile. I broke one and had to throw the whole thing away. I bought another, and have just been a little more careful. It is lightweight, since it hangs from a suction cup, so not as sturdy as the glass feeders. Despite the one that broke, I would still highly recommend this to anyone that want to get the hummingbirds close to your window. It's much easier to clean than the glass feeders.