JBL L300 - true myth?

I'd like to ask if some can write his opinion on this speakers,I had a chance to listen and recommened .
I understand they working great with powerfull tube amp...especially with Mcintosh -is that true?
it's look the components are really good Alnico drivers special tweeters,horns...but woofers made of carton?is that a problem with today standards?
Is the old fashion crossover need upgrade ?

I have lived with these JBL L300 speakers for the last 6+ months and have to say that I have become a real fan of the JBL sound of yore. Putting a 32 watt push-pull tube amp on them has made them sound fantastic (and play pretty loudly). In the next few weeks I'm going to put a high-powered solid state amp on them to see if I can really get the woofers moving.

Imaging is so-so, but overall tone and timbre seems very right. As somebody mentioned earlier, they have punchiness in spades. Incredibly good looking speakers too. Highly recommended, but be willing to pay a premium to get them in really nice condition. This is a beautiful speaker that even domestic partners will not balk at.
I had a pair of these speakers. I loved them, the looks, the design, and the name.

I have a very large family room and they did not do the room justice. Im 18 wide and 28 deep, 9 foot ceilings and fairly active room. These speakers did not do my room justice. Ultimately they were not in the same league as my late 80's Wilson Watt2/Puppy3's.

At he time, I had some world class electronics driving them (arc Ref 2Mk2, Krell KMA-100 Mk 2) and they just sounded confined and like they needed a larger room.

If you can get the L300's in to the right room then you can have something, but IMHO it has to be large.
They were a good speaker, we used to have a set. I replaced them because they were great but not up to some other speaker's standards, and the asking prices on them today are ridiculously high.
Any advice would appreciated,
I want to buy a pair of jbll300, because I bought a pair in 1979 for a grand per speaker and my roomate through them out while I was in hospital from car accident. Just 2 years ago. Ebay they are going for 6 or 7 grand.my advice I need is are there better out there for same. And which one.I am going to try to replace them cause they were best I listened to they rocked the house like a earthquack.
I worked in audio in 1975-6 when these and the JBL L100s were at their peak popularity. The L300s were in the "high end" room in the back, sharing space with the Dahlquist DQ-10, Ohm F, ESS AMT1b, and AMT Tower (with transmission line), driven by the customer's choice among  Accuphase, USA-made Marantz Pro, and Crown. Sources were Tandberg R2R, various turntables with a Fidelity Research MC cartridge and Supex step-up. With those other speakers in the room, the L300s didn't stand a chance; by comparison their colorations were obvious. It didn't help that they were twice the money as well. $1600 in 1975 is almost $7200 today. We sold the DQ-10s at $600/pair ($2700 today). 

About a dozen years later my wife and I used to hang out with another couple, and he was an audio and classical music enthusiast. His rig was a stack of Denon separates and a pair of the L300s in a pretty large great room. They still sounded as I remembered them, with a very narrow sweet spot and therefore an inconsistent power response with suckouts and peaks depending where you stood. Overall they presented a very artificial sound. I was always aware that I was listening to electronics and loudspeakers, unlike experiences I had back then from Dahlquist, ESS, Ohm, and ADS. 

For those here who like/love the L300s, I respect your opinions; I just have a different one. We hear and perceive things differently. I only offer my personal experience to illustrate that you'll probably either like these speakers or you won't. So I agree with the prevous poster who advised not to buy them without an audition.