Flew a few times with Virgin the last month, every time (both B737 and E190) premium economy was empty, bar one guy sitting there on one flight who turned out to be crew.
While the eJet is nicer to fly on I wouldn't bother to pay the full fare, it's very expensive and I'd rather save the money flying economy on Q (Virgin are too cramped for me on the 737) or on the eJet and save the $$$$ for my holiday/time off.
Wonder how really tall people handle it?? (I'm about 5' 5")