I think only a small handfull of people have actually built and use the xtro, most not in the US. To me the box has yet to be proven or used by any substantial number of people, but it still gets recommended highly by some. It is a heavy, non arrayable box, very complicated and expensive to build from where I sit. If your going the DIY route, try checking out some top offerings from Bill Fitzmaurice, as good as anything out there for your uses. I would recommend DR280's over Labs, awesome true horn loaded bass to 80hz, clean, clear and LOUD.