I got a chance to try this (December, 2017) and was told that storage was less than ideal.  Considering that and its age, this was pretty impressive.  Light golden in color.  Still some evervescence although not really showing bubbles in the glass.  On the nose, a bit soapy but nice lemon-lime notes and minerals.  Not much in the way of oxidation, considering and no mushrooms.  On the palate, this is crisp with a lemony note.  Some depth and complexity.  There is certainly some energy.  Way better than one might have guessed.  Very cool.