Good "To Know"... fs2crew have a voice and button version for the PMDG 747 for more immersive flights... But this is expensive addon near the price of the Ifly747 ...
Have the Ifly 747, happy with because I flight less long haul and for the long ones, now I prefer flying the QW 787, those 2 (Ifly+QW) is less expensive that PMDG 747 alone... Mine psychological limit for one addon is 100$.
For the PMDG quality have the 737, corresponding more of the medium range flights I do.