Well Takao's Mission is proving to be something that's not as hard as it seems. Kongo and Myoko's Mission had a bit more "bite" to it, but this one isn't too bad. Least it's not a damaged based set like Ashigara, Nachi, Haguro and Hiei, not that I'm complaining bout those.
Into the 4th Stage now, and a bit of it is from doing Co-Op. Overall, the turnover is better with Co-Op since they are generally finished in around 6-8 minutes. At an average of around 600xp a pop, it adds up right quick.