Hi Barb
I did this tour in 2014. If you put 'China' into the search function at the top right of the page, you'll find a number of reviews, including one from Bob Gray. It's a super, full on tour with lots to see and photograph.
My tips would be to take plenty of wet wipes and tissues plus throat sweets and cold/flu tablets as the pollution gets in the back of your throat (most of my group went down with a cough or sore throat by the end of the trip).
The only downside for you is that I believe that they no longer offer the 'Panda Keeper Experience' (i.e. Panda hugging) at the Chengdu Panda Research Centre. I got the chance to do it and it was truly life affirming - something that I will remember for ever. But don't worry, you will still get to see dozens of these amazing creatures (and their weird cousins, the red pandas!)
Have an amazing time - happy to help if you have any other questions once you've read the reviews.
All the best
Mandy