Direct competition for the Hsu STF-2 I guess:

http://www.hometheaterforum.com/htforum/showthread.php?s=&threadid=207341

Definitely...they can't ignore that market. Competition is good.

Well, damn. I guess more choices are a good thing, but they make the decision-making process that much harder.

So, now my short list for a subwoofer in the $400 range around Christmas this year looks something like this:

HSU STF-2
SVS PD10-ISD
Dayton Titanic 10" kit
Upcoming $400 Rocket sub (as mentioned by craigsub here)
Adire Rava

Am I missing anything?

Here's hoping craigsub does a $400 Sub Shootout in the next few months