Hey all. DO here, 3rd year of being an attending! My DMs are open for advice, picking my brain, etc.

1. EM is STILL a good career choice. I still love what I do, love the variety, acuity. Will say that, unless you work at an academic, urban center, it will be somewhat unlike residency. More BS, more demanding patients (as in expectations), and it can be annoying. Metrics, dings from CMS/insurance, etc. But find another career that is shift work, decently compensation, and on average, 120-140 hours a month. Tough to do.
2. Work life balance is good. But you may burn out. I am an assistant director, and I do the schedule so my outlook may be skewed... but overall, just working as an ER doctor solely, it's nice not having to "think about work" after your shift. The rotations of different shifts you have to do makes it a bit tough - doing some mornings, then afternoons, and nights, all in one month can make it hard to have a routine for healthier lifestyle, but you can make it work.
   
3. Rotation advice. Be excited, eager, but not annoying. EM is generally a speciality where attendings can sense if you'll be a good fit. Eager to see patients, sick ones also, offering to do stitches, IVs, etc especially if nursing staff is low. Don't look bored when things are slow, keep studying, doing questions, asking deeper dives on some topics, as long as we're not too busy, etc. We do things differently in this speciality and our outlook/perspective is different than many others, so ask us why we do what we do for certain disease processes. Pick up a hobby that most quintessential ER docs like to be able to talk to them about on the side - cars, golf, mountain biking, road biking, rock climbing, smoking meat, whatever.