I've tried A LOT of sub 500 buck subwoofers because they are all over college campuses. Haha. I only heard the Titanic once, and not in an ideal situation....and it sounded good for the money. If it was installed right I bet it would have sounded a lot better too. I don't have anything bad to say about the Titanics really, but the little ~100 Daytons are just (my opinion) plain slop. I'd rather have no subwoofer than a really crappy one though. Some people just want bass, no matter what quality. If it was just going to be used for background music or barbeques and such, it's fine. But anyone on this forum is probably going to be listening critically or just plain trying to enjoy music on a personal level at some point.
It is a ton better than say MTX or Sony though! I mean, when I make statements on here, I do it with Audioholics "audience" in mind.... which is not the typical joe. I think on here it's better to recommend no sub rather than a cheap one. Especially when if you save up, you can get a pretty decent subwoofer sub 400 bucks from Velodyne, Dr. Hsu and SVS.
-Chad