For my sister, Si Ew is the name of her dog, but for the rest of Thailand, it is an rich part of the cuisine. The world of Thai soy sauce is much more flavorful and interesting than a single brand that most Americans grew up with. Within the soy sauce food group, there are several flavors and each flavor is used for specific dishes.
With all the varieties and brands of soy sauce, trying new ones can be fun - like trying new wines - you just need to recognize that sometimes you are going to run across one you don't like and will not want to finish the bottle. Fortunately, soy sauce is far far less expensive than wine, and while there's a lot in a bottle, you don't have to feel too guilty if you don't finish it off. I'd guess a family of 2, cooking 60% of their meals with soy sauce will go through a 750 ml bottle in about 2 months.
You can keep soy sauce in the cupboard - there's no need to refrigerate it.
