I travelled in Chennai express in july 2013 and I can say that it is a pretty good train for a long journey. I like the catering service of the train, also the cleanliness was at high standards. The best thing I liked about this train is the route which it covers.
You can see real combination of west and south india through the journey of this train. All credits to Indian railways for raising the standards and living upto the expectations of the people. will love to see manny more trains like this. Also the train runs on time on an average except at few locations but that also it will cover.
Thanks