I bought my first L100s in 1971 with money I earned from managing the student radio station at college. I still have them, the original boxes, sales slip, paperwork, and manual. Many LPs from the time only sound right to me when played through these speakers. They came with a "lifetime" warranty, and JBL replaced one woofer for free when it failed several years later.
My children, who are in their 40s now, grew up listening to these same speakers. I had these in my office for many years before moving to a new location.
About a decade ago, I came across a similar pair in pristine condition which I bought off eBay for a ridiculously small amount of money. I'd heard other L100s that came from the later model runs with the offset drivers, but I always preferred the ones with inline drivers, so I grabbed this second pair as fast as I could.
All of this is very subjective and simply my opinion. My expectation bias tells me that the original L100s are the best of the L100 variations. I've had many newer and more expensive JBLs over the years, and I've enjoyed most of them immensely. As time passed and I've moved up the JBL chain, I've sold a lot of very good speakers, but I'd never sell my straight line L100s.
They just sound right!