Darin:
As others have said the LAB Sub is a true pro Subwoofer that will go toe to toe with anything currently on the market-EAW, Turbosound, Meyer, JBL, Nexo...the list goes on. The real bonus is that it is a DIY project that thanks to Tom Danley's generousity will allow for some serious horn loaded low end on a budget.
If you have the woodworking skills and the tools, build four of them and you will not think of Cerwin Vega again. As Tom points out in the techincal discussion of the LAB Sub, you have to use multiple units to get the real magic from these boxes.
There is a caveat here that others have alluded to. If you want distorted, colored, monotone bass (not true sub frequecies), the Lab Sub is going to leave you mighty frustrated and thinking that you wasted your money and your time. Many DJ's mistake distortion for good "butt kicking bass" Also, a good many DJ's do not know that the so called "speed" (Tom wrote a great paper on this) and often the "punch" of the subwoofer has very little to do with the subwoofers themselves.
I have worked on both sides of the DJ vs Engineer situation. To finance my sound business, I had to do the DJ thing. The DJ gig made me more take home pay per gig, and that was a good thing as it allowed me to do more of what a wanted and to buy more of the gear that i wanted.
However, good peak stop limiters and the phrase so eloquently executed by Don Trump "you're fired" can be great tools to keep many egotistical, chemically "enhanced" DJ's from ruining your rig.
FWIW-When i knew that the rig was doing a DJ gig, I added more low end gear so that the rig would not be worked so hard. Live sound engineers know what DJ's expect and that it takes a lot of solid low end to keep the people on the dance floor.
my .02
Steve S