LGW/MAN Config 747 Economy Rows 21-23

I've tried up the front of the plane and at the back in my time and now I prefer (but understand why other flyers dont agree) sitting as far infront of the wing as possible. Now I've managed to get row 30 and row 31 coming back in a LGW/MAN configured 747 - I'm happy with these, but really like the look of rows 21-23 in Y. Does anyone have any experience of these seats? Are they allocated at check-in?
Seatguru.com comments regarding these seats: "Many enjoy the private feel and quiet atmosphere of this mini cabin" Sounds good to me
Seatguru.com comments regarding these seats: "Many enjoy the private feel and quiet atmosphere of this mini cabin" Sounds good to me
