Travelled from MAS to CBE. Punctuality is good. Though it got delayed by 10-15 minutes in between in some stations, the speed after Tirupur was horrifying. Reached CBE well on time.
Travelled on a sunday, right from MAS hardly some seats were found vacant in the entire train, and hence could imagine how crowded it would be on week days.
Some unreserved passengers board in 2S coaches, mostly they stand near doors and few try to occupy seats.
Food...
more...

is much much better than those stalls available in central station (price, taste, quantitywise). I found a food packet with ARENCO catering seal. But didnt see the vendors with ARENCO badges. (THose who have travelled in 12677 Intercity know very well about ARENCO).
Those who are taller than 6 feet or bulkier would find difficulty in 2S. If so give a try in CC.