If you are getting a balcony, DO NOT take a chance, if you are doing inside on lowest deck's, then OK.
You may end up with a cabin that the cruise line has had complaints from past voyagers, including noise, wind, cabin layout, cabin size.
One more detail, being moved up one deck, if you have a mid ship cabin already to the next deck up and you are all the way forward is NOT a upgrade in my years of cruising.
You will serve yourself better by shopping online for better price.
I have a few suggestions for competitive pricing through internet outlets.
E mail me at email@example.com