See the reviews on the following:
Thomas Cook Airlines Reviews and Thomas Cook Airlines Passenger Opinions about Thomas Cook Airlines standards
Can't speak from personal experience but my daughter came back from a 4 hour flight last week with TCX and is still suffering from aches and pains due to the lack of space (albeit economy).
The reviews may give some insight, but it does not look too promising. Remember the old adage, 'you only get what you pay for'!