i did..and I was given 2 months course of antibiotics..But I stopped taking after 2 weeks as I had second thoughts about the potential side effects and harm there might be even though I was told it was perfectly safe.. Anyway..I didn't think my acne was so major to be worth the potential small risk. Furthermore, I was told later by the doctor that it could sometimes darken pigmentation..not sure if that's true.
Service-wise, I don't see much difference from the expertise of private practice.. They are friendly and nice. Pricewise, you are rest assured that it will not be exorbitant. In fact if you go to a poly clinic first and try to get a referral letter, you will be heavily subsized at the NSC.
You can get some info if you go to their website.
www.nsc.gov.sg