We "moved up" to a CC on the Infinity in July because we wanted to try it and because we got such a great deal on the cruise. So even with the upgrade... it was a steal. I would never do it again... lol. I would save the $100 and hit the casino!
The welcome lunch was not spectacular at all... it was not relaxing for us as we were seated at a two top table next to two other two toppers so really we were a table for six and one man (notice I didn't say gentle-man) made such a huge scene when they offered him something to "drink" when he jumped up all 3 tables shook! Yelling "I don't drink" in the face of the poor waiter was really uncalled for because actually sir... you do drink... you may not drink alcohol...but you do drink... or of course you would be dead....LOL
I thought there would be a dedicated embarkation line... there is not. But perhaps the times they provided us for check in were earlier than others? We had the 11:00 am time. I am not sure of the "upgraded" room location, we were deck 7 mid ship. The afternoon snacks were ok, but again in a ship full of culinary delights... these were nothing special. The CC cocktail party was fine, but with a drink package all our drinks were free anyway. We didn't get the bottle of bubbly and by the time we remembered we were packing up. We went to the Concierge Desk a couple times, but no one was working it so we had to go to the main guest services desk.
The extra points are nice and perhaps on other ships there is a difference.... but it's not for me.