I'm one of the BBTI guys (see my .sig) and I'm also a writer at Guns.com. Check out the following articles of mine:
http://www.guns.com/dear-santa-4460.html
http://www.guns.com/460-rowland-5956.html
http://www.guns.com/ar-pistol-kits-4...land-6188.html
http://www.guns.com/wilson-combat-hunter-9939.html
http://www.guns.com/converting-a-glo...and-10990.html
Suffice it to say that I think that it is a *very* interesting cartridge, to the point where once the conversion kit for a Gen 4 Glock 21 is available, I'll be ordering one ....
Jim