I flew on Air Transat from Portugal on Sunday on the A330-300, and found it quite comfortable. I have had horrible Air Transat flights, however. The L1011's are really nice, but cramped, even compared to the A330's. Their service is not bad, but not up to Royal standards. On Royal you get free bar service, and free headsets, which you would have to pay for on Air Transat.
What really bothers me about Air Transat are the frequent delays, but beyond that, it is the fact that you get on the airplane, and only then do they tell you it's delayed, and make you sit there for 2 hours or so!!! That has happened a couple times already, and it really gets to me. If they could get rid of that habit, I think Air Transat would be a very good airline, and I wouldn't hesitate to fly with them so much.
"it's kind of like an Airbus, it's an engineering marvel, but there's no sense of passion" -- J. Clarkson re: Coxster