okay, answer to my own question.

just completed a 2-night stay here. in summary, quite disappointed. (maybe i expected too high)

the hard product was gorgeous and in good shape but the soft product was way below st.regis standard.

got upgraded at check-in to a grand deluxe room (next tier category) on 16th floor. the fd agent said there were no st.regis suite available. okay no problem, im solo traveler anyway, no need for that much space. my room was clean and nice decorated, quite spacious actually. the only major problem i found was wifi connectivity. very poor signal.

the butler service did not exist at all from check-in to check-out. no one introduced him/herself as my butler, no welcome drink or anything else. most staffs seem cold and not willing to help. overall service at MO was MUCH BETTER.

housekeeping service was good at their job. however it was almost 3pm till your room got done. turndown service was a nice touch and did a good job too.

as a platinum member, you have access to spg platinum and suite guests happy hour from 5-7pm (evening soiree), which now held at the labrezza italian resto by the pool on the 2nd floor. nothing to write home about. i didn't even partake on the first night.

buffet breakfast at main resto on the ground floor also complimentary for plat. overall spread was good but service was below par. no coffee served, you have to ask for it. the food were not replenished fast enough. If you come after 8.30am, there was a long line waiting for the table. it seems very disorganised. personally i found the SGS buffet breakfast was much better in every aspects.

location was not ideal for me, quite far from subway. need to walk about 1 km to the nearest station (orchard). it was not convenient to explore singapore by subway.

conclusion: i might not return to stay here and head back to MO as usual.

ps. sorry for my poor english.