Behind the stage is awesome for shows at MSG! I've seen U2 there like 4 or 5 times, always aweomse. Great sound. I recall my first experience was seeing The Police and it was amazing. You're close to the band, sounds really good.
But like many of us I plan on seeing many shows, so I don't care if every show I see the video screen. I'm there to hear the band -- not see them really. I know we want both, just saying.
Actually last tour on GA I recall sometimes the sound being not as great as when I was in a seat for the show. I've been wearing ear plugs because I'm old and can't take it, but people that are smarter than me can tell you that the best sound of the show is probably not on the floor. The view is great.
Just saying, there's pros and cons to all seats.