Hey Will,
People say that the PMDG744 is super realistic, I can't elaborate on that because I haven't got the knowledge on the 744...
However! The PMDG737 is ub3r-realistic! To the point that nearly every figure you'll take out of the FCOM is matched in this aircraft on flight sim. The autoflight modes are
exactly the same, even when you hit the TO/GA for a go-around in a dual channel or single channel app etc. is unbelievable!!
Now put this into perspective, the PMDG737 was made yonks before the PMDG744 was even a twinkle in the developers eyes
It's worth buying.