Love their steamed pork buns 3/$2, their sesame balls 2/$1 and their peanut/red bean sticky rice 3/$1. Most of their other buns are either 3/$1 or 2/$1 depending on the filling. I would just caution against most of the savoury buns - their chicken, beef curry buns because they have tasted a bit funky to me and my friend did get sick once but everything else is great. A few of my favourite sweet buns are the red bean, coconut and milk jam buns.
Also if you go towards the end of the day when they're trying to get rid of all their buns for the day you can grab a huge bag of buns (8+) for only $2!