WuSong Haw
Google
This is apparently a branch with its flagship store established in Hong Kong. They specialise in Hong Kong style sauces, condiments, and difficult to find ingredients like flounder or sole fish powder, shrimp roe powder, specialist soy sauces for HK style steamed fish etc.... Prices are not bargain basement, but if you were to compare them to the top tier equivalents in supermarkets, it is slightly dearer...
As for quality wise, I would place them minimally at mid-end and above. I honestly have not knowingly tried top quality before, so I would not hazard a potentially unfair comment about their products. I did try the shrimp roe powder and soy sauce for HK style steamed fish..... Really quite good.
I would come to this place to purchase hard-to-come-by HK style ingredients and sauces. Beats being that pesky fella that would go begging friends and family flying to Hong Kong to purchase...