Stayed at SO/ twice - both for work as it's close to my office. Overall, their services were satisfactory, however I found them to be quite inconsistent.
The first time I stayed there I had booked a "City View Room", but they put me on an accessible room on level 2, looking directly at the carpark. It was dark and unpleasant with no bathtub. After complaining to the front desk, they moved me to a better room on level 14 the next day.
On my second stay, they had completely forgotten to service my room one night - by the time I got back it was too late for it to be serviced.
I found the quality of the fit-out quite poor and inconvenient - the basin leaks at the bottom, shower head doesn't stay in the holder, power plug is placed inside the drawer.
It's a great location to be in, but I expected better service and quality of fit-out for a 5-star hotel.