The Toddy is definitely cool. They produce a low acid brew that is super-concentrated, which can then be diluted with hot water, similar to the way espresso is diluted to make an Americano. For a regular cup of coffee, I prefer drip brew, but the toddy concentrate does make a nice cold coffee drink with milk or half & half, if you don't have issues with dairy.
Ken is right on about the abuse potential
When there's a batch in the fridge, it's impossible to resist.