Booked STV for 12 nights starting 27th April in a Deluxe Ocean View.
After reading the latest spate of great reviews I noticed that many of them were from guests in Preferred Club rooms and they all seem to recommend.
Always had intentions of trying an upgrade upon arrival but had seen some on here talk of upgrades costing up to £60/$100 per night.
Called Virgin Holidays (uk) today and got Preferred Deluxe OV for an additional £240/$384 for our 12 night stay so just £20/$32 per night.
Seems a good deal to me based upon what I have read from recent reviews particularly as we will have access to a quieter pool area.