What I forgot to mention in part 1-
As a teacher in a PRU, you are able to experiment with different schemes of works/projects/teaching methods/activites etc etc etc. You have real freedom and that is fantastic! In addition, the options for career advancement are varied and numerous (mostly thanks to the excellent SLT where I work).
On a more down to earth note, whilst you may not teach your subject as much as you like or in as much depth as you like, you can make real, lasting differences to pupils lives for the better. There is nothing like teaching in a PRU, if you haven't experienced, try it for a day!