I sat in 12A on sunday for a 40 minute UVF-POS flight. I booked WT+ (and not Y) for this leg as otherwise I'd end the year on 580 tier points.

This was my first time in this seat. It is a bassinet seat, so there's a chance of others in the row having infants in tow. The seat reclines as far as the others, and there is ample leg room for a 4/5 hour flight. I'm quite tall and I had my feet against the bulkhead; it felt really comfy.

I discovered 2 great seats on this plane, 16C and 16H. Unlimited leg room and better than any WT+ seat if you don't mind an aisle seat. Worth bearing in mind for future trips on a 3 class 777, as it doesn't exist on the 4 class or the 747s.