Having stayed at a couple of Six Senses resorts (Maldives and Vietnam), I would have to say that from a service perspective, they are very very good. Really, these are the only two places I've stayed that seem to implement the 'butler' concept correctly. But I think all Six Senses resorts require a certain kind of mind-set - they are all very rustic, which is nice to some degree, but you will certainly not get that 'over the top' luxury feel that you can get with some other places.