The JA-90 has a set-in mahogany neck rather than the typical Fender bolt-on maple neck, giving it a distinct structure and build process.

The guitar includes Seymour Duncan pickups with a coil-split feature via the tone knob, offering both humbucker and single-coil tones.

The JA-90’s Gibson scale length and P90 pickups are a major draw for players who prefer Les Paul-style playability in a Telecaster body.

Owners have noted the flat fretboard design, which differs from typical Telecasters, and contributes to its unique playability.

The guitar is appreciated for its matching headstock, which enhances its aesthetic appeal, particularly in the white and ebony variants.

Several users praise the guitar's lightweight design, which contrasts with the typical heft of a Les Paul while maintaining similar tonal qualities.

The guitar is compared to models like the PRS SE Custom 24-08, with some users finding the JA-90 more dynamic and lively in sound.

Some buyers have successfully found the JA-90 at a price of €550 on the used market, considered a steal compared to new prices exceeding €1,000.

It's often described as a "LesPaulocaster," combining the aesthetics of a Telecaster with the tonal characteristics of a Les Paul, due to the mahogany body and set neck.

The guitar is likened to a "TeleRickenPaul," a blend of Telecaster, Rickenbacker, and Les Paul traits, due to its unique design and sound characteristics.

Tuned to D standard with heavier strings (12-54s), it excels in jazz clean tones, showcasing its versatility beyond rock or blues.

It's noted that the guitar's hot P90 pickups are ideal for high-output genres, making it versatile for various musical styles.

Owners have upgraded the bridge pickup to a DiMarzio Super Distortion for enhanced heavy sound.

Users recommend stringing the guitar with 13s for tuning stability, noting that Jim Adkins uses this gauge.