Hmmm... Okay, I'll jump into this.
A leopard can't change it's spots. Neither can a 60's luan kit.
You can re-work a 60's luan kit and make it playable.
I see these as more cool factor stuff. Kind of like a VW Bug. Great cars, dependable, cheap to maintain and operate, will easily get you from point A to B...
It's just more fun in a Mustang.
I just posted some spew in another MIJ thread. The drums I referenced there were mostly 70's kits. The build quality went way up around 1970 or '71... maybe even '69.
The hardware got slightly better as well, but the shells were much better.