We very much liked Seabourn. All suite cabins were great and Seabourn doesn't overcrowd their buses and tours. It seemed we could always find a seat where we wanted to go. That was very pleasant.
Dining was great. You can buffet it or sit in the dining room - eat indoors or out. Service - especially bar service - was exceptional.
We took the mid-cruise tour to Angkor Wat. It was very well organized with no waiting in line at check-in to a beautiful hotel. The guide was excellent and spoke understandable English. The temples themselves were amazing. Be prepared for a long hot day but totally worth it. We were disappointed Seabourn did not allow us to book any tours with them on the day of return from Angkor Wat to Saigon (even an evening tour) so we booked our own. My one complaint is that they were very stingy with details about flight times (until we were onboard) which made it difficult to arrange tour times with another company. We were not going to miss Saigon!