I did the Mayo Enhancemed program. Some pros, some cons:
Pros:
Autonomy - forced to make quick decisions and stand by them
$$$ - Some ED's paid 120/hr, UC tended to pay 60-90/hr, and I ended up sleeping the night away sometimes.
Experience - Saw some interesting stuff, including death, seizures, codes, MVAs
Cons:
Autonomy - But seriously, a PMR resident as the lone doc in the ED???
$$$ - because of the opportunity for making serious coin, I felt obligated to do so, at the expense of my sanity at times. I oftentimes cursed the program for existing -- "If this didn't exist, I wouldn't have to work" I felt at times obligated in order to bring some decent bacon, but at what expense? Would I want a PMR resident working on my blue child at o-dark-thirty? No way.
Experience - Although it there are many great memories, some of the dark times/hard cases overshadow the experience. I look back an shudder at times.
Paperwork - The credentialing paperwork/process seems ENDLESS. Make sure the program pays for it. Buying my home was easier than getting credentialed at some of these places. I worked at 2 ERs and 4 Urgent Cares. An absolute friggin disaster of paperwork that later bit me when securing my job post residency. Later, I had to contact each of the 6 moonlighting facilities and get paperwork in order to get privileges at my current job.
Liability - I felt like I was dodging bullets through most ED shifts. At any moment, a blue baby may come in, may get MI, OD, or a nasty MVA. And they did. Sure, help is a phone call away or a helicopter ride away, but I was nervous as ____. For a lot of stuff, I was doing Up-To-Date medicine and hoping that worked. I was lucky I didn't kill anyone or get sued. Mayo covers you, but it would still be on record.
In the end, was it worth it? The money was great, but in the big picture, just pissin on the bonfire in terms of debt payoff.
Near the end I worked mainly at UC where liability is low, the ED is next door to refer if needed, and there may be a PA or other FP to bounce ideas off.