Personally, I don't see it worth the time. Even if you "personalize" it, it will still be "personally" generic..."I like your program because I like the city, the faculty seems great, there's dedication to teaching, etc." You could say pretty much the same thing for each place.
I just made a generic statement and it was never even brought up. Unless you're Thoreau, I'd do the same. Write something neutral. It may not help much, but it won't hurt you. I'd say the PS is pretty low on most programs' radars.
Spend your time elsewhere....the bar. Good luck
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