Buying used vs new speakers from a technology perspective

I bought used Martin Logan’s. The speakers are like new. I saved $7k. And that’s all you need to know about new vs used. 

OP is your question answered, or are you still unclear?  If so, what?

Pretty thoroughly answered yes. Many thoughtful answers from all sides. This will help me when purchasing new and/or used speakers in the upcoming future. Much appreciated guys! 

its all in the drivers working with each other   what freq's  sounds best from the drivers you use and how loud each driver is producing its best sound no over laping freq's as this is the cause of unclean sound    paper cones can degrade with time moisture and how hard they've been played  but possibly still sound great 

There has been really no improvement in the overall technology of speaker design in decades. What has been improved is the reliability and durability of the components used to make top quality speakers. As an example Quads have been around since 1956 and people loved them but they were notoriously unreliable and fragile. In the late 70s Acoustat developed the first bullet proof electrostatic speaker. You have to attack the speaker with a spear to damage it. Sound Labs took the concept even farther and they have been at their current performance level for some 20 years.