I don't think the issue here is how much sound you get for your money, since this package is a totally different product than a normal PA system. Here, everyone carries their own PA. Sure, perhaps you can buy 6 4x12 cabs, but then, like you said, you also need to hire a roadie to lug it all. What struck me about this system is the sheer portability and ease of setup. Who needs a gear van anymore? Just tell the drummer to take the bus! :D
If the audio end can hold its own, and lives up to Bose's claims, then this seems to be a pretty wicked setup. Sure, maybe it's a bit pricey, but so are most guitar related items.
... and that's all I have to say about that.
[U]ALL[/U] generalizations are [U]WRONG[/U]