I've had Red, Black, Blue and Gold (Centenary?) version, and I didn't like any of them. They're all blends. IIRC, Red and Black have an indeterminate amount of neutral grain spirits in them. Blue and Gold consist completely of single malts. The end result is so chaotic it's hard to identify any one flavor. Blue is bad in this manner and Gold even worse. I think the only blend I liked less was the truly awful Chivas Century of Malts, which is made up of 100 malts.
I readily admit I consume the products of Islay and Skye, and not much else so I am more than a little biased on this subject.