Say me a fool, but I changed my JTV for a 700 Acoustic, and I do not regret it. There is more: I kept my 700 electric with me. It's more comfortable to play, even it has some lack of features that I miss if I compared this one to the JTV. For example, you have to connect it to the computer to create alternating tunings... But the volume is higher in the old one, and more convincing, and I find the acoustic emulation far better. There are good things on both sides, but at last is a matter of personal taste, don't you agree?
If you spend a while with the two models, you'd finally find differences, and you will end up prefering one guitar or the other. In my case, I have to say that the 700 is a well-made guitar, comfortable and with a good sound. For me, the JTV has two good pickups, the buttons are perfect as they are, but the emulations... dull for my ears.