I'll be on a 777-200ER long-haul flight to NRT (Tokyo) in a few months. They have an option in the Economy cabin called "Legroom Seat" in rows 17-27, for an extra €80. There's no information about how much legroom the "Legroom Seat" has - does anyone have any experience of this? It's not the same as the exit row or bulkhead seat.

https://www.austrian.com/us/en/sitzplatzreservierung (described half-way down the page).