Because my first trainset as a child was a third-hand Lionel 1435 from 1947, when I got back in the hobby I limited my focus on coil couplers. Initially I shied away from flying shoe couplers, but now that's about all I look at. I like stuff I can learn from, or reinforce what I've learned. Condition isn't as important to me as sets I am reasonably confident came together from the factory.
Dan.