I think,as in any other aspect of Tarot, that we're all different.
I personally feel most comfortable with a deck that I know no one else has ever touched. Yes, I am also one of those who VERY rarely let's anyone else touch my decks..easy enough to pull off since I only readfoe others online.
I have on occasion bought a used deck on E-Bsy or here ai AT. But when I get it I feel a bit creeped our that someone else used it and who knows what their energy was (especially on E-Bay). It find it hard to use the deck at first. I only start to really feel confortable once I have used it enough that I figure most if the energy in it is mine.
As for deck personalities, I don't personally believe in that. They're just cards to me with no personalities. Any difference in the way different deck read or talk to me is something I interpret to the difference in the card imAgery between decks.
Babs
PS After all this....I just bought the Fenestra here on AT second-hand. I DO sometimes buy second hand decks after all. LOL I kept getting signs I was meant to buy it. And who am I to argue with the universe when it starts sending signs?