I did two aways: one was an excellent learning experience with exposure to derm surg, a high quality didactic program taught by faculty, and a lot of exposure to consultation derm with a really busy consult service. I saw SJS, really severe pemphigus, DRESS, etc. They did not give me an interview which was frustrating but expected given that I live on the east coast and program was on the west. Would do it again because it was a legitmately worthwhile learning experience. The other was a bull**** community program in my home state that I rotated through as a safety. It was mostly "faculty practice" read private practice with resident support. Unbelievably boring as a student, very little autonomy, totally bread and butter, a total waste of time.
With respect to aways generally, my mentor once gave me an insight that I found useful. He said that when he looks at away candidates, about 10-15% he loves and will actively try to recruit them to the institution, 10-15% he hates and will advocate against (they act bored, unhelpful, bad cultural fit, etc), 70-80% he is indifferent too and often will decline them an interview given that he wasn't wowed. Everybody is a super star on paper in derm, but in real life are people with flaws. Sometimes away rotations hurt you because they allow the department to peak behind the veil. If you think you will be the top 10% they see, totally do it. Otherwise, be cautious with this unless your goal is simply to learn a lot as opposed to just getting an interview.
I was told by multiple mentors to defer step 2 until after applying given my very high step 1 score. The theory is that I would likely regress to the mean, which I did, and that shows a downward trend. Maybe my step 1 score was just luck is how it may appear. It's something to keep in mind and the department will look for any reason to disqualify your application given they have to narrow 450 down to 30-45 for interviews.
Did subI well into interview season, honored it, but was neutral to my application.