I really like the size of this is EVA Unit-00 Head Sound Coin Bank as it goes well with the display of my USJ EVA Unit-01 and EVA Mecha Godzilla Popcorn Buckets. I have yet to try the electronic function of the coin bank due to the tiny batteries requirement and I doubt it still works. It would be a bonus if it works though I'm not too keen on the function.
To be honest, the face sculpt of Rei on the head ain't that good and I rather they exclude the figure (Rei in her plugsuit) totally. The EVA Unit-00 Head has some cool details like markings, penal linings and shading applications which adds up to the coin back aesthetic.