I had doubts when I came from a Latin Mass to NO due to a move. I have none now.
In fact, I’m in awe of the priests we have had in our parish. The current one has a healing charism.
Validity of the mass? That’s way beyond my paygrade. I’ll follow the magisterium and my local bishop who seems to think it’s true, licit, and valid.
Maybe things will change for me too, but for now I remain suspicious of all the changes to the Sacraments post-Vatican II.