It will add points to your app, on average it will buy you some additional seniority by getting called sooner. If you want one, or think you might need it for something else, go for it. If you're going to do it, do it now, and don't screw around with it. If you get hired at a legacy the month before you graduate you will have spent time and money with zero extra seniority to show for it.

If you're military and plan to participate in the reserves, it will be essentially mandatory for promotion.