I flew them MCO-KEF-LHR last January. The 757's were pretty full, the meals were ordinary, the seating was tight, but other than that I really enjoyed the flights. I especially enjoyed the free stopover in Reykjavik and arriving in London in the early evening rather than 6 AM. Basically I would rate them somewhere above the charter airlines and below the prestige international carriers. As another poster has said, its very similar to domestic USA airlines. They will be getting new 757-300's sometime soon though.
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Tom