So far, it looks great and plays well.
I need to go to school for the new playable hulls, but I expected that.

As an old diesel boat sailor, I really like the addition of the Juliette.
Two minor things I've seen so far, in the USNI database the Graney and the Australian F-18 Hornet will crash the game if selected. The Graney is an old issue but the Hornet seems to be new. I'll check an older version of RA to verify and I'll try building a couple of missions with these models to see what happens.
BTW, thanks to Ivan for adding the built-in Boomer tactics.

Last, as I understand it there were only two Xia hulls and they served as test beds for the later Jin class. Once the Jin's came on-line I would think the Xia's were either de-commissioned or rebuilt as Jin class.