I don’t know much about subwoofers, but I’ll be reading this thread.
I have a couple sets of computer speakers that each come with one subwoofer, but the sound quality of those speakers aren’t all that great.
Instead, I use a nicer 2.0 system with no subwoofer at all, and it sounds good enough for me.
But if you have space for a subwoofer, I say, why not? 