I don't have a problem cleaning it perhaps because I add a drop of oil in before adding the mix or egg. However I agree it takes an extra moment to clean the hinge crevase. Works well with pancake mix - just don't overfill. The egg however tends to leak out the bottom a little as the ring is light weight. Overall I'm happy with it.
These rings are metal with a non stick coating that doesn't really work well...the eggs often stick to them and are really difficult to clean off. The little crevice where the hinge is is really hard to clean too.