XL seats are a decent value at $100 for a transatlantic flight -- worth it for me for the eastbound night flight.
But I just learned the hard way: avoid 15DEFG and avoid 16 DEFG. There were no window seat pairs available, so I booked 16D and 16G, this being the second row according to seat guru and according to the diagram I saw when booking. However, there are two configurations for the A330, and our configuration changed and this was the bulkhead (no central part of row 15). While we had the two aisle seats, we had to uncomfortably twist our legs to be able to stretch them out for sleeping. 16EF would have been torture. (I am about 180 cms, 6 feet.)
VF