Soarjubs

I read the entire Feathering thread and it was difficult to get a handle on whether or not the 4.5's do have this issue, and whether or not it was recurring after being brought to the dealer the first time. I'm considereding buying a 4.5, but would like to be sure that this problem has at least been reduced or is fixable while under warranty.

Also, what build dates specifically constitute a 4.5?

Thanks!