Early '80s NJ series often featured Gotoh hardware and sometimes DiMarzio humbuckers, known for high-output sound typical of the era.

Some early Korean NJ models had issues with neck stability, including twisting and flexibility, which could lead to performance problems.

NJ models varied; some were neck-thru while others bolt-on, with diverse bridge options like Kahler and tune-o-matic.

An instance of a Seymour Duncan humbucker being installed in the bridge suggests potential for tone improvement over stock pickups.

Owners of the 1983 NJ series often praise its "Mojo-Where" relic quality, making it a cherished piece even among high-end collections.

One owner experienced significant fret wear and lifting within a year and a half, indicating potential durability concerns with the frets.

The 1983 NJ neck-through Mockingbird is frequently compared to PRS and Gibson Custom Shop guitars, highlighting its superior playability and build.

The 1980s NJ Series was popular among young Korean men, indicating a cultural appeal during that era.

Early NJ models have foil serial numbers on the headstock, marking them as first-year production and potentially more collectible.

A user successfully improved their NJ Warlock by replacing the original neck with a Warmoth neck, indicating compatibility for significant modifications.