I saw that MCM Electronics has this on sale for $70 + shipping, so I thought I'd revisit this thread. Sorry DaleB, I missed your question awhile back.
My thoughts are - it's a good deal for around $85 after shipping... It's tiny, well built, and looks nice. Soundwise - it's clear there is little true bass going on... and I'd suspect this peaks in the upper bass and rolls off from there (no measurements to back this up - just how it sounds to me). So no, this is not Velodyne Minivee like in performance... but, as long as you can set a xover to filter out the upper bass, the sub sounds pretty good for music. I do think it's critical to get the xover low enough to get rid of some of the upper bass, otherwise I think it can sound undefined/maybe a little boomy.
I returned the one I had, but did snap some pics of the insides... I'll see if I can find them to show what your $85ish would buy.