Thanks for your input guys. I've heard the RELs, Velodynes, and JLs in the past but in show conditions and dealers. So it's hard for me to assess how the Danny's subs stack up, but I got the feeling his subs would compete with any of those subs under $3k.
Mike, it would be interesting to hear from your friend who has the JL Fathom after he gets the completed Danny's subs in his home.