My DS is at Chosen Hill with a Statement and the SEN provision is amazing. He is doing great and I would not send him anywhere else. We did consider a grammar school.
Regarding ofsted, yes Capers is correct in saying that their latest Ofsted is Satisfactory. Please visit the school and make your own decision. One thing ofsted were saying was that children are above average on admission and need to make more progress. The school have made some noticeable changes already and it was packed at open evening. So many applications every year.
I am a firm believer that a school has to be right for your child, that is why we chose it over GS.
I would have quite happily have sent my DD there if she had not passed for HSFG, her choice and the right school for her.