I teach at a sixth form / FE college, so I just teach A levels and I love it. Previously, I was in a school and it is very different. Personally, I much prefer it. I also teach a humanities subject.
The major downside is that FE is the cinderella sector, and have faced a very unfair share of the cuts, and this is set to continue over the next five years. It is a tough time to work in FE as we do not have the protection that schools have.
But teaching 16 - 19 is fab. The students come to you as children, but leave as adults. Over the two years, we really see them growing up, maturing and developing and then leaving to go off to uni (or get a job). I also really enjoy the style of teaching. A lot of discussion, but I tend to do less activities compared to lower school teaching. Listening to the staffroom threads on here, on facebook and on TES I think I have far more autonomy compared to teachers.
But, I work somewhere where my terms and conditions are good. I understand that in some colleges, the t&c are much worse and they're generally not good.
In summary, I have found the teaching to be better, more rewarding and more enjoyable in the post compulsory sector, but my pay, hours worked per week, amount of holidays etc would be much better if I went back into a school.