Welcome to the forum and a big congrats to you on acquiring your 4566! The condition looks excellent. The 3rd Gen 45s are legendary, especially around here. Their accuracy and reliability are superb. I own the 4506, 4566 and the 4516 and of the three, my favorite is the full size 4506. My accuracy greatly improved with the addition of Hogue rubber grips. The originals were just too flat and did not fill my palm as much as the Hogues do. Might be something for you to consider after you become familiar with your 4566. Yes, indeed, a really great pick-up.

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I'm gonna grow fins.