Good stuff! I guess yours is probably like mine - if you really really try you can see evidence of the start of the issue, but it's practically invisible and clearly is a process that has been refined since the earlier batches.
Also my new one doesn't hiss. My old one whined like a dial-up modem, so much so that it was interfering with phone calls.
New one is as close to perfect as I can ask for, to be honest.
It does depress me somewhat though that standards seem to be slipping. The chatter marks should never have been a thing, nor the hissing. And all Jet Black Pluses I've seen - and I've seen a lot - have the Lightning socket sticking out from the device just a fraction of a millimetre. These are all things that shouldn't happen, in my opinion - especially when Apple boasts of 10 micron tolerances in their manufacturing.