My DS is going to Chis & Sid too!
I was not overly impressed on my first visit - tbh it was all a bit mad. There were hundred of parents and children viewing, the school was trying to operate as normal, and we had only just received the good news that DS had passed 11+. You fee llike you are caught up in a whirlwind, trying to visit all these different schools, desperate not to make the wrong choice, it really is an emotional rollercoaster.
DS loved it and we put it as 1st choice, this was because as an OOB C&S is our nearest grammar, and also because I had only ever heard good things about it, and they cannot all be wrong.
I have since returned to the school, to hand in all the various forms, again on a normal day and I was suitably impressed. There was an overall feeling of calm, the receptionist was very helpful, the pupils I met were friendly (and courteous) and it all felt so much better. We are now looking forward to September, relieved that we don't have to go through the trauma of the 11+ again
Good Luck to everyone taking it this year, and "Hello" to all the C&S newbies!