I flew manchester - orlando return with Virgin in November. Booked over 12 months previously, Virgin changed their baggage policy allowing our baby a 20kg suitcase that wasn't originally in the deal. A raise in standards there!!
Outbound was a 747, packed out, no free economy seats. The crew worked hard on that one, but still managed to provide everything 'in the book'. No frills, a REALLY cheap price.
Inbound was an Airbus, what can I say? More room, nicer seat, great skycot and the IFE was a million times better than the 747. The crew were in short supply, but once again everything was as 'in the book'. When I wanted extra booze, I went and asked at the galley, the crew were just too busy to serve it to the seat.
My holiday for three to a nice florida hotel cost about £1500, premium economy would have added £500ish quid to the price. I would rather slum it and have the extra spending money. However it is up to you............