A friend and I took the 11 day Kimberly cruise from Darwin. There were several aspects of the cruise we found particularly enjoyable. Above all, our fellow guests were wonderful people who had come to the Oceanic Discoverer (as it was known back then) for its lack of glitz and exposure to geology and culture. It was an exceptional group of discerning people and we made some good friends. Many had traveled with Coral Princess before. We enjoyed mingling with them and the ship dynamics (open seating dining, lounge areas) facilitated that. Second, the crew were very sociable and hardworking and the purser was a true professional. Crew were mostly Australian. The food was not Michelin star but tasty and well plated. We liked that we were not nickel and dime on excursions and soft drinks. Finally, we enjoyed the ability to embark and disembark without any queues because of the small number of guests. We noticed we could go closer to shore than the big ships.
The overall experience felt less "canned" and formulaic than the mega cruise lines. It is not cheap but we felt it was money well spent on a unique small ship experience. We would not repeat this trip but are thinking of Papua New Guinea with Coral Princess in 2016.