This place is a family favourite. There are two stores in Singapore that we've been to. The main one is in Eunos and has a bigger menu. The second is in Marina Boulevard (near Downtown MRT station) and while still good, has a smaller menu. The main difference in menus is the range of sides and desserts.
The service in the Eunos store can be VERY slow. After ordering your food, expect a decent and long wait time. Still, the burgers and sides are great - the Hawaiian burger and the mushroom burger are probably our favourites. Kids and adults alike shouldn't go without have their rice icecream (either vanilla or chocolate, with chocolate coating, shaped like a love heart). Skip the chocolate brownie though - you'd be better off with NomVnom's chocolate cake if you fancy something like that.
Oh - they also do home delivery! So, if you're feeling peckish at your hotel or apartment, just call them and get your food delivered!
Cons: SLOW service at Eunos store