Here's what Sigma says about the SE Series Acoustic GTCE W SE-PT Preamp & Tuner:

The Sigma GTCE Electro Acoustic, Natural features a solid sitka spruce top which offers a versatile tonal character, perfect for a wide range of genres and playing styles. Its grand OM cutaway body is an idyllic all purpose guitar, as it responds greatly to numerous playing styles and techniques with equal ease. In addition, the Sigma GTCE features a bone nut, which offers added sustain and resonance, as well as allowing the guitar to stay in tune for longer periods of time.

Furthermore, the GTCE is well-suited to the performing musician, as its voice is able to fit beautifully within a live mix, and its built-in Sigma preamp and tuner enable amplified performance and basic tone shaping for live settings. With a natural appearance, eye-catching abalone headstock inlay, and a beautifully shaped black pickguard, the Sigma GTCE Electro Acoustic is perfect for live events, studio sessions, and jams with fellow musicians.