Personally, (and this is just me).... I would not pay extra just to go on a new ship.
The only reason we did this one was because it went to two ports that we have never been to...and then it ended up being a Blogger's Cruise. (I post on the Blog every day.)
I am not a fan of big ships.....and this is about as big as I care to get.
My favorites are the Spirit class ships although I do like the fact that on the bigger ships....karaoke and the piano bar are right together....VERY CONVENIENT!!!
The cool thing is that if Promenade gets to "busy" to walk through...Lower Dream Street (deck 4) is usually a GHOST TOWN....so if you are just needing to walk from the Atrium to the back of the ship...it is perfect.