Ive never played their higher end models, but their entry-level guitars are some of the best sounding for the money, I think. I've been playing a Regent for a long time and I love the sound. I put heavier strings on it, never had it properly set up, and it plays like ass because of it, but the low-end on it sounds really good for a cheaper guitar.
I bought a $200 one for a friend and it really totally outclassed everything else I compared it to in that price range.
Now, as far as their Yiari upper-end stuff, I have no idea how they stack up to comparably priced instruments.