It really depends on what level you are at in C&A (Gold, Platinum, Diamond, or Diamond Plus). The higher the level, the better the coupons.
We are D+, and until the new coupon books were announced yesterday, they weren't worth the paper they were printed on. Now that they are increasing the free internet minutes, providing some free laundry service, and providing a free photo, they're not too bad. Haven't seen the new books, so can't speak with any authority.
Serenade of the Seas b2b January 2016
Serenade of the Seas b2b January 2017