I've owned this guitar for about 3 years, and during that time, the sound has improved. The previously light bass notes have become more pronounced, and the resonance now vibrates in my stomach. The high and mid-range frequencies, which were once harsh, have softened and gained depth. The string height has been low and easy to play from the beginning and has hardly changed. I usually didn't loosen the strings, only doing so when storing the guitar in its case. I believe the neck condition will remain stable, and the current good condition will be maintained. There are, of course, no buzzing sounds. However, there is almost no saddle remaining. I have never touched the truss rod. The finish is generally glossy, but the areas where my elbow rests and where it sits on my right leg have lost their shine. There is no clouding, which is common with Yamaha guitars. The ebony on the neck has almost no dents and is jet black. The frets are about 70% remaining. The Brazilian rosewood on the sides has a slightly yellowish hue, but the back has a very bold grain pattern. I think it's a pretty good grain for an early L15. There are no cracks, splits, or binding separations. The endpin has been changed, and there was an additional pin installed on the heel from the beginning. The tuners have been replaced with Gotoh tuners, but the screw holes have not been drilled. The original TM50G tuners are included separately. The bridge pins have been replaced with aftermarket ones, but the originals are also included separately. A Yamaha case is included, but it's unclear if it's the original. The metal parts have lost their shine, but they function without any problems. I think the condition is quite good for this model. There are minor scratches, but nothing critical, and the playability is excellent. The sweet scent of Brazilian rosewood still lingers faintly. I will ship it in the included case, protected with multiple layers of bubble wrap.