I use many types of Poker sized Copags (various index), Fornier, Modiano, and China plastics, and recently, it's been exclusively Fornier EPT's, rotating decks every hour at my home game.
Some China plastics are decent as well, but use them less than the others. The Poker Stars Copag's are OK, but not my favorite.
I have no issues with Copag, have not noticed the smell. My current Copag cards are peek index, therefore don't use them as much.
I gave other Copag cards to my buddies that have home games...much better than paper cards...