Yeah the L-1500 seems to have a love/hate rep from owners. I just never gel'd with them at all, had to do extreme EQ to get anywhere close to what I wanted from them. My first one had a bad opamp from the factory....noisy-screechy, unusable. Memo sent me a new, revised opamp chip....noise greatly reduced then.
But my continuing attraction to G&L lead me to try a Climax with similar elecs array. Seller said he couldn't tame its harshness even with thumpy flats, hence the sale. Undetered, I snapped it up for a very nice price, $425 shipped w/molded case. Dead mint condish, feather-weight, in a rare Goldburst finish. Wow, had to have it! This one would still be with me if only it sounded....
acceptable. Sadly, had to let it go after weeks of fooling with it. IICR, it was a '94.
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Tried anothe 1500 that I got here from TBer bdgotoh. Light weight, #7 neck with ebony board, with a gorgeous 3-tone burst finish (no one can argue that G&L did great finishes). That was the one I modded. Finally faced the reality that me and a 1500 were never going to get along. I give up.
In an odd twist of fate, I found major joy with an L-1505. At that time I had two 5500's and an L-2500. That 1505 sounded terrific to my ears, almost as impressive as the 5500's, and vastly sweeter than the 2500. Anectdotal and subjective opinion from a miniscule sampling, but still had me wondering if that 1505 had the same exact elecs as the 1500's had. Nothing from G&L would surprise me.