Re: JS1000, JS1200 or JS2400 (best one)
I can't speak for the 1200 or the 2400.
I have owned a 1998 JS1000 for about a year now.
It is very easy to play, the tremolo (Edge Lo-Pro) is fantastic, and the tone is really cool.
I immediately replaced the Fred with a Tone Zone and installed an alnico 8 magnet in the TZ. The Fred is just too bright for my tastes.
I also immediately installed a huge brass tremolo block. This really helped with the sustain and warmed the tone up considerably.
I had a 540R that had an original Edge tremolo in it for a while.
I think the original Edge is a little more sensitive to slight movements, flutter, etc.
Hope this helps.