Originally Posted by teemuflyer

On international flights the MCE beer and wine benefit is not in effect. Everyone in Y gets it (not of great quality, but still). However, being as far back as you are, you will have a lot of noise and traffic with the galley and lavs being very near by. LHR-DFW is a surprisingly long flight, and if you enjoy legroom, you might consider splurging on MCE. Even better in PE.. totally different experience, albeit not business, but very respectable for a day time flight.

Availability of buy-ups to PE is clearly defined by availability. If you can score it for $300 or less, definitely worth it IMHO.