Since the photo doesn't provide much idea of scale, do note that, while we don't have particularly large hands, the Mikado is slightly bigger than one of our mitts.
This is a great sharing cookie. The thick dark chocolate border aside, it looks deceptively light, but that same chocolate is stuck between four layers of not-as-crisp-as-we-wanted-but-still-crisp wafer madness, so it's pretty decadent. Three bites at once (ie. a corner) is enough for us unless we're in cookie overdrive.
Though Mikado is a brand name for the Japanese Pocky cookies in Europe, our speculation is that this wafer might be at the least a visual homage to a Russian cake layered with cream that's also called Mikado. Confirmations or clarifications are welcome!