Sustain: Actually sustain is better on our guitars than on a normal traditional acoustic guitar. The main reason is that we use premium grade Mahogany for our necks, and we embed stainless steel latch and bolt components. The neck plate connector is also stainless steel. As energy transfer is primarily horizontal (from nut to saddle through the neck), our design makes for very efficient energy transfer, hence prolonged sustain.
Intonation: Our guitars have intonation in line with premium brand guitars in the US market - which is very good. Moreover, because our necks are detachable, you can quickly add shims behind the neck connector plate to compensate for any intonation issue that may occur over time. (Though we don't have a single report of this being done to date)