I'll start by saying that my ROL is already certified...
I would say that location and GUT - stressing the GUT - would be the way to go (of course, there are many other factors to consider: spouse, children, housing needs, schools, communities, social scenes, etc.). I had a pre-interview ROL, and while - about halfway through - things didn't seem to change much, my second half interviews threw my ROL for a loop. In the end, I knew who my top two were, but it was hard to figure out which to put over the other. My 3-5 were by far the hardest - determining where I would prefer to go if my top two didn't come through. The bottom half/third/quarter is easier to work out, since I think many of us would rather rank all programs (unless you're interviewing at like 12 or 13+) than risk not matching, so even a program that isn't all that appealing will still make it onto the list. Fortunately, I haven't come across any "bad" programs that I would rather not rank than end up at.
As a joke, towards the end of interviews when all of us applicants were candidly discussing programs and ROL's, I suggested that to get a true gut feeling, sometime during the final rank week get drunk to put all of your inhibitions aside, and look at your ROL through "true" eyes. I [probably]won't be taking my own suggestion, but you never know... someone, somewhere out there, may think, "Hey... that's a good idea."
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