I've never tried the Sergeant Chicken Rice in Singapore but have gone a few times in Hong Kong and absolutely love it. It's cheap, quick, pretty consistent, and actually has proper dark soy sauce and crushed ginger :) The chicken is (usually) boneless and the rice extremely flavourful! The only gripe I'd have is the soup which is a little different from what I'm used to in Singapore. That said, this was far more satisfying than my recent meal at Satay Inn. Pure comfort food.
(I've only tried the Food Republics in TST and Tai Koo and think the latter is far better quality)
Cityplaza, Taikoo Shing