If we could have sent all four DCs, without any compromise to our life - ie, not scrimping and saving all the time, crossing fingers every time the car breaks down, never going on holiday etc (as friends of ours do), then yes.
DH and I both went private all the way through, but when I look at what our peers have achieved, very few have justified the VAST amount of money spent on their educations. I don't believe that I couldn't have achieved my salary and qualifications without having been to private school, although perhaps if I'd been focused on being a barrister or surgeon from age 11, that may have been more difficult (but not impossible) if I'd come from a state school.
We've just turned down a scholarship at an outstanding prep for our son - he got a top scholarship, but we weren't offered any help with the fees, and although we could afford to send 2 and a bit children at a stretch, we can't afford to send 4, and we decided against as he's at an excellent school and his teachers have all advised that he will get into the superselective grammars here without too much difficulty. That, coupled with overhearing one girl at pick up time on the day of the exam complaining "Mummy, WHY don't WE have a helicopter? Everyone else has one". And no, I haven't made that up.
We do loads of extracurricular activities with the children - they do music, dance, drama, sports, we go to museums and art galleries, they have access to chess, rugby, hockey etc at school - they don't do Latin unfortunately, but they are getting a good education and interracting with a FAR more diverse group of children than I ever met. I didn't know a single child at state school until I went to university
and I don't want my children to be as isolated from the 'real' world as I was.