Well, 13 deaths over a 4 year period with a "possible connection" - that's an incredibly small number. Many times more people were struck by lightning. And how many lives were saved over that same time period because a drowsy driver kept him/herself from falling asleep at the wheel by consuming 5 Hour Energy?
That said, I have no plans to EVER consume a 5 Hour Energy or any other energy drink. These products fall under the category of "supplements" with the FDA, and as such, the health risks associated with them are largely unknown. To be fair, manufacturers cannot load up their products with ingredients that are known to be toxic; and it's also in their best interest to sell products that are safe - companies that kill people don't last long and aren't usually profitable. BUT, the combination of ingredients in 5 Hour Energy and other supplements has NOT been clinically evaluated by the FDA, so while they appear to be "safe," just how safe they are and in what dosages is completely unknown. I feel that supplements do have a place in society, but folks who consume these supplements should realize that they are participating in a clinical trial. The chances of an adverse reaction are small but real. I personally am not willing to offer up myself as a data point for someone else's profit. Not when there are other products that do the same thing and have a much longer and well-understood clinical history.
Looking at the ingredients for 5 hour energy, it seems likely that most or all of the "energy enhancing" effects of the product are due to the caffeine content. Although it's worth repeating that the combination of other ingredients, though apparently safe individually, has not been evaluated in combination; nor (generally) have they been evaluted in terms of dose-response. Ask yourself if you want to be a data point in a clinical trial. The answer may be "yes," but I believe it's important to understand what you are doing.
Finally, stimulants affect different people in different ways. It's useful to know how you, individually, are affected, but one should also use caution interpreting anecdotal information. As has been said previously, the plural of anecdote does not equal data. At least not reliable data.