Best thing about the Key which we did on our transatlantic last year was the lunch with the Chops Grill menu and the breakfast on disembarkation day. We bought it on sale at a cost of $4 more a day than just the cost of internet. With it we were able to board immediately when we arrived at the port which was only allow suite guests, pinnacle and key guests to board outside of the assigned boarding time.
We also purchased it for our upconing cruise on Radiance in April even though the price, even sale price has gone up.