I was seated slightly off to the left when facing the band up in one of the private boxes. The SQ of the coliseum isn't horrific, nor is it great. The few concerts I've seen at Nassau sounded better then MSG for instance.
I did have a bit of a corridor effect in the box which was obnoxious, but when I stuck my head in front of the 'spit guard' in front of our seats and into the open space, things didn't sound bad at all. The SQ of Roger Waters doing the Wall a couple weeks ago was better there, but DMBs was the second best (SQ) I've heard the band.
I think the unlimited beer, wings and private listening room equipped with its own bathroom greatly contributed to the overall experience for me too though.