Rain Harvesting Pty Ltd RHUL99 Leaf Eater Ultra Rain Head- 3 in. Round

The manufacturer's site says this comes with multi-fit cap. Can any of you verify this, as I'm looking to match with 2"x3" downspout. Thanks!

Is the screen on the leaf eater fine enough to filter mosquitos or do I need to install additional screening as the water enters the tank?

Can this be painted?

Is this leaf eater ultra better than the leaf eater advance that comes without the plastic comb looking thing? how else is it different?