I have an AF50E RW and I'm pleased with it.
Exterior build quality seems fine, but I haven't put a camera inside it to examine bracing or glueing.
Photo below of the AF50 (right) next to a JF4 - out of curiousity, just played them both for the last 20 minutes for so.
Both the AF50 and the JF4 have narrow-ish feeling necks.
This particular JF4 has more balanced tone and better volume than the AF, and is really bright sounding
for a hog-bodied guitar. It's a little lighter than the AF but feels more substantial.
I've had several JF4s, they varied quite a bit - this was the best of them.
The AF plays easily, has slightly lower action than the JF4, with a slick neck, also feels as if there's
tighter (smaller) radius to the fretboard (haven't measured to compare).
It doesn't quite have the difficult-to-articulate "all of a piece"
feeling of the JF4. It feels smaller, is very comfortable to hold - body on the AF isn't as deep
as the JF4.