Hmm I personally haven't used NannySOS myself but I have heard quite a bit about them from other mummies in my group! Generally the feedback I've heard is quite positive lah, they are quite well known in Singapore for their confinement nanny and babysitter services, and mummies say their nannies are quite experienced and properly vetted which gives peace of mind. But I would suggest going to their Google reviews and also check out the Singapore motherhood forums or Facebook groups like "Singapore Mummies" because got more detailed firsthand experiences shared there, and always do a proper interview with the nanny before confirming because at the end of the day the personal fit and chemistry with your family is very important one!