We just returned from the southern Caribbean itinerary of the Valor. This was my 6th Carnival Cruise and it if probably my top rated for cabin/deck, food, service and ports. It was a 100% positive experience.
I booked cabin number 6483, a corner wraparound balcony, and it was worth every penny. (I think it was about $250 pp more than the standard balcony cabin option that was available to me.) Carnival calls it the Premium Vista Balcony Cabin when you're booking.
The interior of the cabin was about the same size as a standard balcony cabin, but the layout was different, so it was a nice change. Also, the large wraparound windows were beautiful.