We flew out on Sunday and were in the bubble. We had seats 79h and j. There was no bar blocking foot space under either seat, so perhaps it depends on which seat you have. The disadvantages of being up there are the small overhead lockers (so if you have a large bag it has to go in the large storage cupboard between economy and first class and there's a bit of a scrum to get them out when you land), plus it's very easy to bang your head on the lockers if you are tall. You also have to watch the delicious food, drink, blankets, hot water bottles etc go past you to first class!
The advantages are that it is a little quieter and you have at least 2 cabin crew to serve much less people, and you do get off the plane first, so pretty good advantages really.