I have three Makarovs, and all three functioned flawlessly, right out of the box (after cosmoline removal of course)!
No break-in required, they feed anything and everything reliably, and are as accurate as auto loaders costing hundreds of dollars more. Sights are also dead on, with the two Bulgarians that have fixed sights.
The Maks have no reliability issues that I'm aware of, unlike many other pistols, and are a breeze to clean and lube.
Bill