We finish a 4 week vacation in Thailand and Malayasia a few days ago, staying at 7 SPG hotels which included 3 StRs, 2 Luxury Collection, 1 LM, and 1 Westin properties. We were impressed with our stay at the Bangkok St Regis, and found the postings here very helpful in setting our expectations
We give this hotel high marks for the service, SPG recognition and value, placing it within the top 3 StRs that we have stayed in over the years. Below are some of the specifics of our stay.

Recognition: We stayed in room 2224, pictured in the posts of Chad75, a corner room on the top floor noted as the Caroline Astor Suite by other posters. This is a superb room overlooking the city with views of 2 other luxury hotels we stayed at over the years prior to the construction of this StR. A minor issue with this and other rooms is that one can barely hear the train as it passes by, although we did not hear any traffic on the street below. We can't identify more impressive recognition when one of the Front Office personnel left her desk @ checkin area, greeted us while we waited for the elevator during our stay, telling us she and her colleagues appreciate our loyalty to SPG, and that my metal SPG card was only the third that she had seen. Cards like the one given to me was one of the first batch of Life Platinum cards and SPG now provides only plastic rather that metal loyalty cards. She also asked if we would be staying at any other StRs, and if so, she would notify them of our arrival (she did as on our arrival at these 2 properties, and we received a note from her in our rooms with a basket of fruit).

Service: We received the excellent butler service, and no longer ask ourselves why does one need a butler. Rather we found a number of tasks we gave our butlers, and were impressed by the work they did for us. One involved wrapping a present for a young sushi chef who was our favorite while working in NYC who now has his own restaurant in Bangkok with a wait list that frequently is up to 6 months!! My wife became ill probably from some food she ate on our JAL outbound upon immediately arriving at the StR. Needless to say, they delivered breakfast I picked out for my wife from the morning buffet as quickly as I returned to our room. A problem we mentioned to a manager when he asked if there was anything that could be done to improve our stay was quickly fixed. This problem was that the bar where one uses the frequently mentioned free drink cards was not accessible to my wife as she was in a wheel chair recovering from hip surgery. Within 4 hours, we received a call telling us that engineering was working on it, and 2 hours later a second call informing us that they would build a ramp during the evening and night shifts and have it in place by the AM. This happened so that we could enjoy the StR Bangkok's Bloody Mary cocktails!

Location: Like Alanslegal reported here, Gaggan is ranked as the best restaurant in Asia and 7th on the San Pelligrino worldwide list. It is a few minutes walk behind the StR, and if one had not made a reservation 3 months ahead of a StR stay, it appeared to be common practice to walk from the StR to the restaurant a few minutes before 6 PM in hopes of a cancellation. Their 25 course (25 small bite) menu should not be missed, as this restaurant will soon close and be relocated to Fukuoka Japan

Value: We paid $225 for our room for each of 3 nights. When staying at a hotel, we have a $ cut off where we either use points or pay with our SPG AE card and in this. My wife commented that she thought it was impossible for any hotel, including any hotel in Bangkok, to compete with the StR based on recognition, service, product, and the value.

Overall, this is a superior SrR and we graded it as one of their top 3 properties.