The Yamaha DGX-670 is a powerhouse for the home hobbyist, successfully bridging the gap between a traditional digital piano and a full-blown arranger workstation. The centerpiece is undoubtedly the CFX Concert Grand sample; when paired with Virtual Resonance Modeling (VRM), it delivers a harmonic complexity that punches well above its price point. While the GHS (Graded Hammer Standard) action is a reliable staple for Yamaha, serious classical players might find it a bit 'light' or 'plasticky' compared to more premium wood-key actions, though it remains perfectly responsive for intermediate repertoire and pop playing.

The real magic lies in the user experience. The transition to a high-resolution color LCD makes navigating the massive library of 600+ voices and 263 styles remarkably intuitive. The 'Super Articulation' voices are standout features, adding realistic nuances like guitar slides and saxophone breaths that breathe life into MIDI arrangements. However, the trade-off for this versatility is bulk. At nearly 50 pounds, it's 'portable' in name only; you won't want to gig with this frequently without a sturdy case and a strong back. Additionally, the internal speakers are clear but lack the low-end punch needed to fill a large room without external amplification. For songwriters and home learners who want an all-in-one creative hub, the DGX-670 offers an unbeatable feature-to-price ratio.