I did it, it was alright.
There are a lot of big name folks that give lectures, but only about 30% of the lectures are worth sitting through.
The first session gets pretty tedious with a ton of education theory from some big name but not so good speakers. Also during the first session everyone has to give a non-medical lecture, so you sit through about 60 people talking about random non-EM topics.
The second session a few months later is a lot better, the speakers were better and the topics were more high yield.
While the content was average at best, its actually a really cool chance to meet like minded folks in EM. You meet a lot of fellows/young faculty types, and since you're all essentially trapped in an office park on the far outskirts of Dallas, you get a good bit of time to hang out.
Its pretty expensive, as they pretty much force you to stay at this Omni which is really nice but isn't cheap, plus you have to get to/from Dallas twice in a few months.
I did it my first year out of residency when I was still looking for a job in academics, for me it was a decent thing to put on my CV, helped me get a feel for what academic medicine is really like, and let me meet a ton of cool folks. Overall it was an alright way to spend two weeks, but not really high yield in terms of lecture content or skills that I walked away with.