It's not so much about what happens after your induction in an SEN school as doing it in such a setting in the first place. SEN, esp as it relates to behavioural problems (EBD etc), requires experience, good teamwork and tact, qualities which you hope to develop during the first years in teaching rather than having already as an NQT. While I wouldn't say it's impossible, it certainly is a testing and demaning way to complete your induction, as pressure on you will be relentless and you have to fall back on your own reasources, think on your feet constantly and so on. Some thrive in such an environment, others wouldn't want to handle it during their NQT year but perhaps later in their career and the rest wouldn't go anywhere near it as they know it's not for them. So you need to be sure you are able to cope well in an SEN school, and preferably you already have some experience in the field, such as being an LSA. That the school is truly supportive and have experience in helping NQTs through induction. I don't think having successfully completed your induction in a special school, it will somehow damage your future career in mainstream education. On the contrary, schools with behavioural and other problems may very much value your experience.