Sam's congee is one of my top places to visit for congee and rice rolls. It is a casual restaurant and it can get really loud especially in the morning since there is a lot of people going in and out during breakfast time. It is especially busy on weekends and you will most likely experience a wait time. One time I came a few minutes before the opening time and there were already a few people waiting outside the shop. I have never experienced a long wait though since it's not the type of restaurant for people to hang out at for a long time after they are finished eating.
My must get items include: minced pork and preserved egg congee, plain rice rolls. I love their rice rolls here. The texture is very smooth. I enjoy most of the rice rolls with filling inside, but my go-to is the plain one.
I recommend you trying this restaurant if you haven't yet.