There are several brands of electrolytic caps. The most important thing they offer over table salt or the old school salt tablets is a balance of electrolytes and a buffer. The buffer is important to help with the ingestion of the electrolytes.
Each brand has they own idea of what to include in the caps. As with anything used on the run, YMMV. So do not invest in months supplies of any one brand. The good thing about Salt Stick is the dispenser tube they also sell allowing for a way to carry them on the run. Note, other brands of caps may fit in the tubes. In the event you do not use the tube, a simple zip lock works perfectly well.
So in answer to your question...
I am not a fan of everyone using a caplet supplement. However, I do believe that if one takes the minimum dose, it is not all that bad, but it is more than most runners need especially if drinking a sport drink. If you are a runner who reports that they have a white salty stain on the face and clothing post run, then I would suggest using them as a sport drink is not quite enough. The other exception to the above would be a sport drink intolerant runner. I would start with one at the beginning of the run then one an hour. Titrate more or less depending on how they are working. You may also want to look at other brands as well. Note, when I first started in this game, I would read of folks bringing sea salt, table salt or some other salt in a contact case to consume at some point in the race. Do not do this approach. A lump of salt in the gut mid run will draw liquids from the system and actually dehydrate you and possibly lock the gut for a period of time.
One final thought... Disney uses PowerAde not Gatorade. In addition, the race mixes the drink about half strength to assure it dissolves. It also helps those with a sport drink issue. Unfortunately, one cannot simply dilute PowerAde in training because the powder and liquid versions are of a slightly different formula. I know this does not help, but it may help someone following the post.