To tell you the truth, the main reason I went with the PB1-ISD over the VTF-2 is that the Hsu was on backorder from EVERY SOURCE I could find online at the time I decided to buy it.

I was actually dead-set on the VTF-2 after hearing it at CES 2003, but I wanted a sub very badly and couldn't wait any longer!

In hindsight, that's a silly reason to choose one over the other, but I don't regret my decision one bit. :P