At the end of the day, I find that most of my bookings are based on a bunch of factors like times, duration, costs, award availability, etc. Whenever I fly a new type, it's because I lucked into it...not because I actively tried.

I've flown the 787 once, DEL-NRT. From looking at seatmaps at the time, it appeared that JL was usually using something else on this route (777?) but was using a 787 something like twice a week. We got lucky - it was a last minute booking using Avios and we got two coach seats in the very back of the plane.

We enjoyed the two-side configuration. However, to the point that airlines are going to do what airlines are going to do, we felt like it was a 31" seat. Dreamliner itself: very nice with the big windows, big overhead bins, and "new" feel. My seat: every bit as uncomfortable as any other 31" coach seat in the world.

Although we noticed that Y was wide-open on most days, booking at the last minute with Avios, J was booked solid.