Can't comment on Parmiter's, but DS2 has Asperger's and ADHD and his first year at secondary school (WBGS) went far better than we ever could have imagined. He enjoys secondary and is happier than he was at primary school. If you need any general advice about the transition, I'm happy to answer any questions.
How did your DS2 manage with going to a larger school. Also having classes of 30 chikdren with one teacher. My daughter day dreams and gets anxious so can easily be left unnoticed by the teacher.