I went to a primary school where the secondary level school was one of the first ever places to merge the local (prestigious) grammar school with the secondary modern to become a comprehensive school and so took no eleven plus.
Shortly before I was due to move up to the new comprehensive my mother left my father and took me to different parts of the country so I attended no less than seven secondary schools, some good, some less so.
I probably had something of an indifferent education but I read a lot and often got subject and class prizes for doing well in exams. I scraped enough 'O' and 'A' levels to become a teacher and married an extremely clever, well informed and well read chap who didn't pass the eleven plus either.
When we had children we were very much more au fait with the education system than were our poor parents and both of them passed the local eleven plus. One passed with the top marks and was told she could choose between nine grammars schools and go where she wanted. Both went to excellent, academic schools and we were very pleased with their education.
On the other hand, I taught with quite a few colleagues who were eleven plus 'failures' and saw at first hand how embittered they had become because they had not passed. It made them anti grammar, anti elitist and anti academic education. I don't think I would have felt quite the same but I was quite glad I hadn't had to jump the hoop and blame myself for failure. However, I do think I would have benefitted from a steady, fast track, academic education in one (not seven) schools.
I think that, despite drawbacks, a disciplined, focussed, academic education should be offered to all children who could benefit from it.