I've had this model for years and it continues to perform perfectly. In fact, I just bought two more because I have so many hummingbirds this year. This model hold 4 cups of nectar. You'll need a small funnel to fill it because the opening is small. The base screws off the glass jar allowing you to clean the inside. However, the opening is quite small, so it's doubtful you'll ever get a bottle brush in there. When I clean mine I pour a little bleach inside it and add some water and shake it around. Then I make sure that I rinse it many times to ensure that the bleach is gone.