I checked off used but with springs, but honestly, many of my carry guns have not even had new springs put in. My process is to buy the gun, break it down, clean it, inspect, reassemble and then go to the range to test reliability and accuracy with both range ammo and quality defensive ammo. If the gun proves itself to be reliable and accurate, the last thing I want to do is start playing with things like springs. If it doesn't work, for any reason, springs will be replaced as a first matter of attempting to remedy. If that fails, it will either go back to the gun shop, gunsmith, or factory to be fixed.
Let's be realistic here. How many people ever shoot a gun enough to warrant spring replacement? I'd bet (based on nothing more than personal experience) that the average handgun in civilian hands gets something like 1000K rounds through it in its entire life. Remember that we enthusiasts who can put 1000 rounds downrange in 6 months through one gun are statistical outliers. Most people will never shoot a gun enough times in a lifetime to wear out a spring, so if it ain't broke (or getting to the point where I have reason to believe it will), i don't fix it. Once a gun is broken in and working properly, the last thing I want to do is change something.
Remember, that as Voltaire said, "perfect is the enemy of good."