I had the privilege of trying their 10-year cheddar last year as part of a swanky Scotch & Cheese Tasting at the Beverly Hills Hotel (see pic below) and it was absolutely divine. Sharp and flavorful, of course, with bonus little crystals that seemed to burst in your month. A bit like Pop rocks meets cheddar. Okay, I exaggerate, but you get the idea (they're actually just crystallized Calcium Lactate). Oh, and in case you're wondering, it paired exquisitely with the Glenfiddich 30.
At $50/pound, it might be the priciest cheese I've encountered yet. I bet it's well worth it.
That's the 10-year cheddar at 9 o'clock.