I fly through concourse A quite often and can testify the lounge is significantly better, I'm actually always disappointed if I'm in B or C. Decor is much improved, almost no overcrowding. My favourite part, for those who care, is the smoking lounge as it has a real cigar bar feel to it and doesn't stink at all. The real highlight of concourse A is the Shake Shack burger restaurant. For those who haven't tried, its easily one of the best burgers and milkshake I've had.