Lord knows that JBL sold a ton of L100s. And lots of folks love(d) their L100s.
Back in the early 1970s, I used to think that the Marantz Imperial 7 and the JBL L100 were it. The speakers I lusted to own. Actually had four Marantz Imperial 7s in my (very short lived) Quadrophonic system.
Then I listened to Altec A7s.
A very dear friend still has a pair of L100s as his main speakers and he loves them.
No longer my "cup of tea" but I am always happy to listen to music with my friend on his speakers.
Would I buy a pair? Nope.
Do I revile them? Nope.
They will appeal to some and won't appeal to others.
Nothing more than that.
Just my opinion.