I've got a definite love/hate thing going with my Korean JTV69. Other than the E-string-off-the-neck thing, the physical part is not bad at all. I don't have any particular issues with it staying in tune, and I tend to use the whang bar a fair amount. The pickups are quite decent, though the singles are WAY brighter than the humbucker.
Electronically, it's been in the shop multiple times. Main issue #1 is the stupid modeling off/on switch continually sinks down just enough that it won't engage (or disengage if I do get it on.) Still twinking around with it myself to try and get the spacing right.
The bigger issue is that when the switch went ga-ga at one point something hosed the alternate tunings where the majority of them sound both the original note and the shifted note. We are talking U-G-L-Y with a capital UGH here. All attempts to reinitialize the tuning fail, and nothing appears wrong when looking at them in workbench.
All of that said, when it does work it is really handy in a live context. Being able to pull a passable 12-string, sitar and other tones out of the hat is really nice. But I still am not sure that I'm not going to just dump it at some point...
My .02,
TT