Having cruised previously with several other cruise companies, we chose Celebrity solely because of the itinerary. Living in England, a chance to see some of Australia and New Zealand with days in Singapore before and Sydney afterwards justified the long haul flights.
Embarkation in Singapore was a farce, taking two and a half hours! The TV and Safe didn't work in our cabin and our cases didn't arrive until late in the evening! We also had a constant problem with our sea pass card not working properly.
Celebrity fairly obviously rely on selling expensive packages to swell their funds. Internet, Spa, Alcoholic and soft drinks and even water packages were being constantly pushed. (A bottle of wine for US$50 could be bought for Aus$12.50 !)
Spacious and comfortable once the initial problems were sorted.