welcome to Cruise-Chat.com.
While I have not been on "Navigator otS" yet, I've had aft-facing balcony cabins on multiple occasions.
And to be honest - I love them. The balconies are often somewhat (or even considerably) larger, and wind usually doesn't affect them as much as balconies on the port and starboard sides of a ship. Balconies facing forward are the worst - it is often virtually impossible to use them while the ship is underway.