Took this as part ex, and know nothing about them, never played a games console (unless you count the stuff we had in the early 80's) and have no interest in it.
One of the girls have told me that:
It's the newer one that the Kinect can go into (but doesn't have one with it)
It has two controllers (I spotted that) one of which is wired from the earlier model with an adapter
Call of Duty 4
Gears of War 2
(I'll check the others tomorrow)
Is it worth £100 ?