I bought a L3000 earlier this year in Japan for a really nice price. I personally love them, best headphone i ever owned. They do have some shortcomings and technically i think the W5000 or O2 are more advanced, but all the good things it has make up for a really good listening experience, it's an extremly refined headphone.
What made me sell them was the high going price here on head-fi
I couldnt really sit on a headphone that expensive even though i paid much much less.
AND, my 400 Euro speakers still are more enjoyable overall. So yes, i think it's overrated especially for the going price around here. I would NEVER buy one for more than 1000$.