The few sets of Classics I have had, new and used, are not showing any issues.
I don't recall seeing any issues but I don't come across too many sets of Ace trucks on my travels either.
A couple of people I know who have AF1 trucks have so far been happy with how they performed too, when I think about others who are on Ace.
From seeing all the issues in the Ace thread, I was not at all in a hurry to get the AF1 trucks, but I don't need any new trucks at all, so it wasn't really much of a deciding factor anyway.