If you're an incoming 1L, definitely use it to try and get a summer associate job after this year. Working in a firm 1L summer is pure gold when you go to OCI the next summer. I think a firm or two might consider it a bad thing, but on the whole, it will be a huge plus on your resume.
My only caveat is to make sure that in every step of the process, from getting a 1L summer internship, a 2L summer associate position, full time job, you make sure the firm allows you the time to see if it's right for you. If the firm pressures you into an answer without encouraging you to apply for other jobs or go through OCI, it sounds like they're looking for cheap labor (cheap because they have to train you less), and don't care about your career.