For me the upside of a good comprehensive has to be the chance that it will bring out the best in all the DCs (inc MY DCs!)> In some ways, I almost think some grammar school DCs, selected at 11, are 'deprived' of the opportunity to seriously develop skills in non-academic subjects. I went to a Grammar MANY moons ago and it has to be said, art, HE and oddly, music and sport had a VERY low status compared to physics, Russian and chemistry! I can genuinely state that there were several girls in my year who really shouldn't have been at the grammar, who were really struggling, and this is before the advent of the psychotic parents you find on the 11+ website! That school is now practically full of privately Prepped girls, I understand from MILES around but it also has to be said, the local secondary moderns are feeling the academic pinch!
So I'm glad I'm in a good comprehensive area as I believe that it will serve my DCs better than a grammar might, esp seeing as DS2 would have to be seriously prepped to get in!
My one gripe about some posts on this thread- the assumption that 'grammar is better'/'every parent wants the best for their DC, ergo, 'grammar''. Simplistic, perhaps?
Finally, I do smile when you read about the erstwhile wealthy who have sent their DCs privately but can no longer afford it: the assumption that Tybalt and Polly will OBVIOUSLY go to the grammar, not to the SM, like 'private' equates to grammar!