I opted not to get a "paid for" upgrade during my last trip. Part of my vacation was concierge, part was not, all was at AKL. There was no way I wanted to change rooms part way through our short trip so I begged and pleaded to be kept in the same regular savannah room through my entire stay. I loved my room and I have no idea what I missed not being on the fifth/sixth floor! Having the concierge lounge was enough for me!
That being said, our next vacation this Easter is entirely concierge, and I am really looking forward to the extra square footage, and the fridge in the room! When it was just DS and I, the extra space really wasn't needed.