Stereo Integrity HT18 DIY build

I had no idea that Stereo Integrity was located a few minutes from my home! B)
The new 18" H/T subwoofer looks like a great deal:
http://stereointegrity.com/product/ht18-18-subwoofer/

This flat pack sealed box offered by DIY Sound Group:
http://www.diysoundgroup.com/sealed-subwoofer-flatpacks/4-sub-flat-pack.html

I already have an amp, so this would be an 18" H/T sub for right at $300. That seems like a really good deal.

Anybody run one of these SI 18" subs?
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