Oval sound hole, short scale.
I just received one and noticed that the extension of the neck that provides 4 extra upper frets for the 1st string bows back quite a bit, making those upper frets lots harder to play.
The neck relief is pretty close to where I like it, 0,005"at the 7th fret.
To give you a better idea about what I'm talking about:
When forcing the 1st string down above the 24th fret, the string hits the
20th fret first.
Ideally it should hit 24th fret only.
At this point, where the string is just making contact with the 20th fret,
the gap between the string and the 24th fret is around 0.03". This means
that the 24th fret is at least 0.03" too low, that's quite a bit. Lowering
the action is not going to change that, those upper notes are still going to
be noticeably harder to play.
My question is if all GJ-15s have this flaw.