The Yamaha P-515 remains a benchmark for players who prioritize authentic touch above all else in a slab format. The Natural Wood X (NWX) action is arguably the most substantial feeling in its price bracket; the use of real wood provides a mass and inertia that plastic actions struggle to replicate. For the classical pianist, the escapement mechanism is a subtle but vital touch for expressive trills and nuanced pianissimo passages.

Sonically, the dual-sampling of the Yamaha CFX and Bosendorfer Imperial offers two distinct personalities: the CFX is bright and assertive, while the Bosendorfer provides a darker, more European warmth. The Virtual Resonance Modeling (VRM) does a stellar job of simulating the sympathetic vibrations of a real soundboard, though the built-in speakers, while clear, lack the low-end punch to truly do these samples justice without external amplification.

At nearly 50 pounds, 'portable' is a generous term"this is a beast to move alone. However, the build quality is tank-like. While newer models have since introduced the GrandTouch-S action, many purists still prefer the P-515's NWX action for its slightly heavier, more deliberate resistance. It's an ideal choice for advanced students or gigging pros who need a professional-grade practice tool that bridges the gap between a portable keyboard and a high-end Clavinova.