Yah, you probably should. But after you get used to the game, you should defiantly get it. It really makes the Russian boats more fun to play.
As for other sound mods, well I've only tried one. I can't think what it's called, but it's got sounds from a real sub. It's pretty cool, but it adds an annoying "pop" sound to everything. But if you don't mind that, it's pretty good.
Also, once you start looking for mods check out alfa tau. It adds new models, and playables to the game. It's has a gorgeous kilo model, I posted a picture of it in the screenshot thread.
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