Had to post my recent experience. Of my current collection, the last La Trappe Quad release from the LCBO is just blowing away all others right now. Do it, get it, enjoy it.
To provide some perspective, my current favourite style as we go into winter is belgium dubbels, tripels, quads, sours, barley wine beers, and seasonal christmas beers. I very much enjoy a good porter and stout in between them. These were my first love, but I moved on to the others for more of the overall complexity and subtlety.
For my recent related comparators, it includes, Westmalle dubbel and tripel, Chimay blue and red, Westvleteren 12, Orval, Rochefort 8 and 10, Achel Bruin, St. Bernardus ABT 12, Gulden Draak, Cantillon (Cuvee St. Gilloise, Rose de Gambrinus, Grand Cru Bruocsella), De Ranke Kriek, Dulcis de Succubus, Duchesse de Bourgogne, Rodenbach Grand Cru and 2009 Vintage Oak, Gouden Carolus Triplel and Blue, and La Chouffe. Plus a bunch of other more basic craft beer.
It is not too surprising, as the La Trappe Quad is one of the older in my collection, proving ageing these beers makes a difference.
My most memorable other recent experience for the enthusiasts were the Liefmans Goudenband and Thomas Hardy's ale.