I've not tried it but, given that it currently holds the award as best in the world, it should be rather tasty!
http://www.thisissome...435-detail/story.html
Here in the UK it's sold by one of the major supermarket chains (Sainsbury's, which is generally well-regarded as to the quality of its products) as part of its 'Taste the Difference' range (which is the label it uses for its premium food products) at a price which is only about 25% higher than a regular cheddar.
Cheese on toast? Well, yes, it should be nice but it would be even better served with a decent chutney, on good quality bread. And please, please, please, remember that decent cheese should NEVER be served straight from the fridge. I'd give it a day or two at room temperature (without any wrapping) before trying it.
Chris
PS: If you ever get the chance to try Keen's Cheddar, grab it with both hands! (I'm not sure whether it can be sold in the USA though. Some countries prohibit the sale of unpasteurised milk products).