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These products are very special because they are produced by Trappist monks in Belgium. Proceeds from sales of the three beers and four cheeses, all made on location at the monasteries, go to meet the needs of the monasteries and foundations involved, and also serve to sustain employment in the relevant regions. You do end up paying quite a bit more than you would for a Bud Light (a 750 mL bottle of Chimay Blue is about $15), but the quality is fantastic and well worth the occasional splurge.
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When paired, I actually didn't find the cheese or the beer was enhanced. I generally don't enjoy my cheese paired with any beverage besides water, though, so I'm a bit of a tough sell on any cheese-pairing. Not many beverages can compete with the way a cheese tends to completely coat the mouth with its texture and flavors. The exception are highly carbonated or fairly acidic beverages with effervescence that cuts through that coating (e.g., sparking wine, acidic beers, etc.). Even then, it's important for the flavors to be complementary.
That doesn't happen with the Chimay Grand Cru and the Chimay Blue, in my opinion. The beer lacks any acidity, and its smooth sweetness merely runs over the cheese film on the palate without creating any sort of flavor combination.
Still, it was fun to try the beer and cheese together: that's what trying new things is all about! I certainly would recommend either the beer or the cheese to any beer or cheese enthusiast.