the new Epik Empire would absolutely blow that puny little fart box out of the world... info can be found here
http://www.epiksubwoofers.com/blog/ & Here
http://forums.audioholics.com/forums/showthread.php?t=62447
I'm with ya, the problem is the room where we are putting this is a fairly open family room with limited space (due to kids and furniture), so I really don't have much choice beyond going inwall. When we build our next house, then I'll have a dedicated HT room where I can put the "real" equipment, but unfortunately I don't have the room or the resources right now.
I've been scoping a couple of inwall subs, but the ones I have been seeing are:
* Artison RCC 300
* Speakercraft Cinema Sub 12
* Earthquake Thor-10
* Triad Bronze 4
I can work a deal with the Earthquake right now, but I don't want to pull the trigger unless I know that's the way to go. Unfortunately, as you mentioned, there just isn't a lot of info on inwall subs. The other detail is that we don't have much of a real audio shop anywhere beyond Best Buy.... ugh.