Someone made an exact knock-off (I mean, sans the actual motor, screen, blades, and stuff that makes it worth money) of a Breville Juicer. I own one that was gifted to me by a much more well-off friend.
Carrot and ginger juice. You are welcome. Citrus? (Ha!) That is the reason his wife got a different one. You are instructed to peel the rind before juicing. This is also on a machine that is damn-near commercial. No way you can throw a citrus fruit into this thing and expect juice.
TL;DR: there is a reason these juicers don’t sell. They are very niche. Oh, they make a killer beet juice too. But they cannot do greens or citrus without serious prep.