This place (59 Serangoon Garden Way, 6284-0800) has been around for so long that my last visit there probably predates this blog. I recall it being much bigger back then, although I'm not entirely sure what else has changed.
For Pow Sing, besides having a long history since 1983 and being committed to sharing the taste of Hainanese Chicken Rice to fellow Singaporeans, the new experiences in their menu are worth trying too.