Generally, I agree with Loving Ortho...
However, I will say that if you fall below 240, are motivated to strengthen your application, and have an extra 2 weeks off to study for Step 2, definitely consider it. Let me explain:
For Step 1 I studied hard for 4 weeks using QBank and First Aid. I completed about 70% of questions, was averaging 70-75% and scored just above the mean.
As a military applicant, I had to take Step 2 early. I studied using nothing but QBank for 2 weeks (First Aid for Step 2 is not nearly as good as it was for Step 1). Finished roughly 75% of the questions available, was averaging 70-75% on timed tests (notice this is the same as my Step 1 stats). My score jumped 27 points, and it made it onto my ERAS by late October... and I am certain it helped me quite a bit.
Obviously, if you can't put in the time, or are not scoring as highly on practice tests as you would like, don't risk it. But, if you aren't satisfied with your Step 1, and can take some time to study without sacrificing SubI's etc., it might pay off.
For those 240+ (or even high 230s), you would have to REALLY nail Step 2 to make yourself look much stronger in terms of standardized test-taking, so I wouldn't bother.
Just my opinion...