Talk to me about menstrual cups.

I have been considering getting one for a while now, but keep putting it off.

The main things holding me back are:

1. How messy it may be to remove.

2. Leaking, since I don't like pads.

3. The blood "swooshing" around inside me. Weirds me out. Especially laying down with it, wouldn't the blood just pour back out of the cup?