Personally I am not a fan of the inserts. I have tried both in mallets and blades but always revert back to the full milled face. I prefer the sound and feel, not to mention it helps with off center hits. IMO

I have a Super Select Newport 2.5+ (Special Deluxe MOTO), a 2021 Champions Choice Newport 2, and a 2025 Studio Style Catalina (among others). The insert putters definitely have different feel than the Newport 2.5+, the Catalina with the Studio Carbon Steel insert has a harder feel, and the Champs Choice has a copper insert and a softer feel. My favorite of the three is the Catalina, but I game them all and they all have different meaning for me.