The future benefits of joining a group will be greater than the present ones. Undergraduate research gives professors something to single you out from other undergraduates on reference letters. They can point out your abilities that would not be evident to them from just course work. It could be the one thing that gives you an edge over someone who has not had the experience. Also, the type of research that you do will be an important factor depending on the industrial position you are seeking.
Some graduate schools use undergraduate research in their admission decisions.
Also, the familiarity of the lab environment will help your transition into a research group in graduate school and this will only help to speed your completion of graduate school.