Agreed. You could make your own, as you could make your own Worcestershire or teriyaki sauces. But for me, I'd rather spend the time doing something else.
I generally avoid Chinese food & soy sauce due to MSG sensitivities (all soy sauce contains MSG as a by product of fermenting). Kikoman, however, isn't as bad because they don't add hydrolyzed veggie protein (another form of MSG) like the cheaper brands do.
I also notice that Kikoman is what most Chinese restaurants use (at least around here).
Another alternative that I can use in moderation is Fish Sauce (made from anchovies & used in Vietnamese & Thai cooking). As long as I use it moderately, I tend to tolerate it fairly well.
I like Kikkoman low sodium. Frankly I cannot really tell a difference from the regular kikkoman. I generally dislike most Chineese restaurants for some reason, though I really enjoy sushi. The local sushi places are all owned by chineese ironically. The soy included in the to-go boxes is definitely different from the stuff that they have in the restuarant and I dislike it. I suspect its chineese soy sauce, but not labelled in the small plastic dipping cups. I keep Kikkoman at home for this.