Samesies re: Hopkins and Duke
Wasn't sure about Mayo, had heard some meh things, but there is a new PD taking over this year who really worked on revamping a lot and seems like you'll have excellent opportunities there with a huge variety of experience and the ability to cater your fellowship to your needs/desires. Honestly, most seem to be willing to give you whatever you want (to an extent).
Felt weird about UCSF based on interview interactions. The people were great, but it felt less personal than many of the others.
WashU rocks...all around.
Haven't really seen any red flags for any program thus far. Some I like less than others (mostly those that have primarily SICU rotations and less variety), but even still there seems to be some variety in those programs.