Here are some points, as I think of them.

The Good

• It was fun. On par with the best one-week vacations I've had, but less fun than Hawaii.
• I look significantly better, directly caused by the fashion workshops. My sister was briefly jealous because while I usually won in the raw-g department, she had always handily won in the looking-good department, and this is no longer true.
• I took to heart Try Things, (hypothesis) directly caused by in-person admonitions by high-status instructors. Previously I had focused far too much on exploitation over exploration. Concrete example: I went to a code retreat with Arlo Belshee last weekend and my roommate did not, while any normal reference class would have said he was more likely to go, and it was super-useful.
• I actually applied (and am applying) Gendlin and Tarski to the scary object of my inner mental life. I recommend Internal Family Systems as very useful though I have no direct comparisons I can make. If it turns out that it's actively harmful or even significantly worse than average mainstream psychotherapy I will update strongly towards standard-retreat-rather-than-awesome.
• Directly after the minicamp, I made several time-management changes to my lifestyle that have persisted until now, giving me many effective extra hours per week. Concrete example: noticing that the marginal return on playing Dominion online was negative past about the first 10% of my time spent, and actually cutting way back.
• Noticing when I'm being too abstract that I should try to provide or ask for a concrete example. ;) This was very much caused by admonitions during minicamp and some supporting reminders afterwards by John.

The Bad

• The minicamp became more and more disorganized toward the end. IIRC this was because the instructors were updating as they went and thought they discovered that they could do better in the second half than originally planned, but the fact of disorganization stands.
• Several of the exercises we did felt artificial and did not feel like they hit their intended target. Concrete example: when we played the game of arguing for an answer instead of reasoning towards an answer, to feel what rationalization felt like, I just felt like I was playing a game, nothing like when I actually notice rationalization.
• I felt like there was too much stuff to learn and not enough practicing stuff. By a wide enough margin that I'd list this here.

The Ugly

• I came unsettlingly close to not looking for counterevidence like this when presented with investment advice. Not actually too close, but it was still unsettling. Constant vigilance!

Edit: formatting, also the investment advice did not come from SI, but from one of the attendees.