Trip Advisor's "Class of Service" does not cover all the classes of service.
For example, Premium Class is far different than Main Cabin, and Economy.
I was in Premium Class, as there were no more seats left anywhere else (last minute flight). Premium Class gives you 4" more leg room (which is quite nice) and the pitch of the seat in front of you makes a big difference as well. Enough on that.
This flight was on time both departing and arriving- non- stop.