Composite Panerai Radiomir Question

[Ravager135]

I was hoping someone who owns any of the composite Panerai Radiomirs if they could chime in on the durability of these watches and their cases. I am specifically referring to the PAM339, 505, 504 models. My understanding is that these references are all made similarly with an aluminum case and a ceramic deposit to the outermost layer. They are not truly ceramic, but rather what Panerai calls “composite.”

Most of these references are older and no longer in production and they can be purchased at quite a discount. I’m specifically looking to see how well the cases have held up. I have read many comments about the aluminum showing through easily over time. I have heard others say the cases still look pristine 7-8 years later.

I have an IWC Top Gun Chronograph and I have been extremely impressed with their ceramic. I understand this is not the same thing. I have had a bad experience with DLC cases. I’m looking for reliable feedback from forum users. I am very well versed in Panerai having owned or currently own 5-6 different pieces. They have all been in steel or titanium though. Thank you in advance. Pictures always welcome.