I put a pair of 1200Fe-8's in my 200T3's.
I will start by saying I have never listened to a 1200Fe before and WOW, these are some really nice drivers.
The 200T3's have a very wonderful and full midrange that is really smooth and accurate. A snare drum to die for and bass guitar that snaps with every finger on the string.
I always felt the 200's were lacking in this department a we bit but the 1200fe's as a stand in are really quite stellar. No wonder GT likes them!! Sorry Greg I'm a little slow!!