I just tested your Mig-21 and it new model is extraordinary and much much better than the old one.The livery is good and i don't know if you mod the FDM or not but it give some good feeling and handling.However since it is a beta version so it does contain some issue:
-I am not sure what version of this but the mig-21 has many version and there is some difference between the models and the FDM but i guess it not the big problem.
-Some bugs with the animation (most of them are at the wheels and the well doors).
-It still need some extra care at the wheel and the speed brake and try the new wing contrail.
-The cockpit is too need some improve.
-About the VPAF livery we have to face at the problem that not many of Mig-21s do really have a wing insignia ( you will be amaze that i can't find any Mig-21 VPAF pic that have a wing insignia that mean most of them don't have) the Mig-21 MF 5121 of Pham Tuan (the one still remain in Museum) doesn't have a wing insignia or no longer have(may be because the rain and rust).
Here is the real picture:
-Last but not least it does have a RATO and have been used a lot so it would be nice if we can simulate it,it will be some innovation in FG.