Pros:

-As flyers mentioned above. No repeat
-Great product
-Great airline with service(at least half of them)

Cons:

-Awful mileage accu. on most of the airlines as a sheep on board(BA, CX to mention a few)
-No through-out service and each airline has its own story and expectations
-LONE4 price hiked more than 60% in UK. It was £1298 + tax in May 2008, and the latest price is £2100 + tax.