though many here will disagree,...
the xm TA product is very good. the avod and power ports are a big plus. service can be spotty at times depending on the aircraft as crew numbers vary dramatically depending on a/c type. crew to pax ratio can vary from 1 to 40 to 1 to 24 on the 767 fleet alone.
also if you judge your crew by eye candy factor, this is a re-introduced route this year and so many more "experienced" crew will likely be bidding these flights.
others will be better able to comment on food and bev selections...
but once again the avod and power at every seat option raise the bar across the pond vs. the american carriers imho....