The reason Death Wish gives you the jitters is because they recommend 2 1/2 tablespoons of grounds per 6oz of water (as opposed to 1 tablespoon/6 oz ). It's tasty, but it doesn't have more caffeine; you can get the same effect from Maxwell House if you use the same proportions.
Death Wish is quite tasty, but it's no more effective than any other coffee. I don't know what those pussies are used to drinking, but I don't think it's real coffee.