I own the Eureka - for my purposes, and the price I paid, it's fantastic. It grinds great for filter coffee, and I can fine tune it to my heart's content. It gives nice, consistent results.

But you're right, the retention is not good. I'm looking into getting some sort of 3D printed bellows so I can flush out the retained grounds - I've otherwise resorted to tapping the hopper a good few times to get the last gram or two out.

I did originally consider the Fellow Ode 2 or the Opus but the price was just too much. I'm sure they're excellent but I couldn't justify spending so much money, €180 for the Eureka is already quite a lot.