F-111 module is good and bad
Good - less stuff to strap into, instant raft - stay dry, Mach 2.5 ejection envelope. overall the most comfortable seat to 'enjoy'
Bad - lots of bits had to work to be successful (but actually DOES work!) WEIGHT WEIGHT WEIGHT, the average MiG probably needs the extra engine to carry it.
..also the ejection does not hurt, but the landing does. (to Quote Big Al - strap yourself to a chair and jump out of a 30 storey building). Design is same as Apollo 11! - except you will likely land on land! (Can't steer whilst in descent!)