I recently tried the NIF Neymar from a friends account and didn't feel a major difference worth the 4.8mill coins.
I'm thinking of selling my Neymar and replacing the following players.
Allan & FS Bentancur for Base Blanc & 88 Vieira
TOTY Neymar for NIF Neymar
Mertens for NIF Messi.
TOTY Neymar is by far my favorite player and no matter what team I play with, I'll still finish Gold 1 but im really tempted on trying that Vieira 88.
I also have CR7, Mbappe, Maldini, Roberto C, Lala, Mbappe & Courtouis so the only weak spot of my team are the cdm's(Allan & FS Bentancur) and Mertens.