Got one.
love it.
use it all the time, sooo comffortable, and everything is in easy reach.
using alongside a logitech trackman wheel (trackball with ball under thumb)
you can put the keyboard away (or have it in front of you) and use the trackball and nostrommo on the arms of your chair
no problems with it for sim games (MW series, freelancer, freespace etc) and also good for MMORPG's (ddo - although clicky heavy builds like monk and wiz can be a little more challengeing)
never really tried to play with macros much (i got the razer one) simply focusing on keyboard replacement, for comfort more than any actual input advantage.
My mw4 profile:
the little thumb button for enemy targetting
big button on side for jj's
d pad for selecting weapons,
wsad cluster for turning and speed up/slow down
A few extra buttons for startup, shutdown, 'image enhancement' (love that from mw2) zoon, etc.
wouldn't use anything else