1. Plastics fellowship used to be one of the most competitive fellowships, but once it went from two years to three it dropped off a bit. However, it's still reasonably competitive - I think between 10 and 20% of applicants don't match most years. Matching usually requires some good letters of recommendation (so it really helps if you can work with a plastic surgeon during your general surgery residency), decent inservice scores, and research. It doesn't necessarily mean you need to take a year off to do bench research, but you do need to have at least some clinical stuff on your CV. Matching into the upper tier of programs obviously requires a greater degree of all of these, plus it helps to have some connections through a mentor or faculty member.
2. Most integrated plastics programs have a 1+5 or 3+3 model, with the 3+3 having a decreasing amount of time on non-plastics rotations as you progress. This varies from program to program.
3. There are several subspecialty fellowships you can pursue, including microvascular, Craniofacial, cosmetic, and hand.
4. Overall I think the trend is toward an integrated model but there are still plenty of traditional pathway programs and I don't think it will be going away anytime soon.
5. I find the overall mindset of plastic surgery to fit my personality better than any specialty. Particularly with reconstruction, plastics is largely a "problem-solving" field - you learn a bunch of techniques, and then you have to customize each surgery to fit the problem and the patient. There often isn't a right or wrong answer, and if you ask three different surgeons how to do a case you will get three completely different answers. I also love that we operate all over the body - in a typical week, I may do a cleft lip, an open cranial vault reconstruction, a breast case, a hand case, and a leg reconstruction. The variety is different from almost any other field and it keeps me challenged and interested every single week. But if you want a practice where you super-specialized and only do breast reconstruction, for example, you can have that too.
6. My lifestyle is pretty great, although that's kind of by design as (again), there isn't a one-size-fits-all model of practice. I am in an academic-affiliated practice doing pediatric reconstructive surgery and Craniofacial, and so my practice is almost 100% elective with a smattering of ER call. Most of my days are 8-4, and I don't work weekends. I am fairly active with research and administration so I do have some extra responsibilities on top of my clinical duties. I don't make as much money as I would if I were hustling in private practice, but to me the tradeoff is worth it as I absolutely love both my job and my life outside of work.
7. Most general surgery residencies are 5 years but some (like mine) have a built in research year (or two) making them 6 or 7 years.
Hope that helps!!