The Quantum is a beautiful ship and the folks staffing it are generally helpful and friendly.
The Dynamic dining is not. Think regimented dining. Cannot get times between 5:30 and 9:30 unless you take extraordinary measures. Website to book dining and events is not functional and changes nearly impossible as everything is booked up in advance . Food is 0K to Good once you get there depending which restaurant they assign you each night. We did not enjoy Silk even though we have lived and worked for years in many countries of Asia.
Issue for handicapped travelers is that there are almost no handicapped places in the theatre and other venues. The first few in wheelchairs take them and the other dozens miss out as no other seats are available. With only two banks of elevators the cabins can be more than 450 feet from the nearest elevator.
Cabin is fine if small. lots of storage, good balcony, excellent steward service. Very far from elevators (more than 400 feet). This is a problem for anyone not totally mobile. Ship has only two banks of elevators so many cabins near the bow or stern are a long way from them.