I rate this as one of the most important of the old quad mixes from the 70s. Just below Aqualung, Paranoid, and WYWH, and maybe above any of the BOC or Aerosmith titles. One of the major 70s rock titles mixed well to quad.
I fact when Audio Fidelity issued the album on an audiophile disc and did not consider the quad mix which was available at the time - then AF launched quad layers just after, it was a real setback for them, lost momentum so sorry to say.
And at least we are now getting this out once more in hopefully a perfect transfer of the quad mix.
A few labels still believe in physical media as a profit endeavor.
I almost ordered two copies of this, but I got my senses back.