Hi, could I ask if, after a few years, the change has ended up being quite noticeable? I want to start out the headphones hobby (?) with neutral headphones and had decided on 600/650 with 600 winning out due their sound as pads wear out, but that was before I learned of this revision.
Unfortunately, I cannot try any of them except one very worn-out (and probably with old pads) HD650. I just want a good reference pair to anchor myself a bit better as I start, but as the first pair, I will also be keeping them forever, somewhat religiously, so I am sorry if I sound a bit fussy.