I own the SLG 200NW. I use it to practice with headphones when the neighbours would be annoyed otherwise
Sound with the headphones is ok, certainly not great. I haven't tried it through an amp yet.
The neck feels like a real classical guitar, but mine came with the strings set up too low, which led to annoying buzzes on the 6th string. Access to the higher frets is much better than with a classical guitar, as there's no body in the way. Since it feels different on the SLG, I usually avoid practicing pieces with notes in the higher frets on it.