DGX670 provides *immense* bang for the buck, *however* I am disappointed that at full volume, playing the piano only? the speakers crackle. Which means the DGX is much better on headphones than speakers. And no, other than the just-discontinued PS500, there was nothing else that offered that level of sound tech at that price (the ps500 was better in every way, except no programmable style(yet) and no left-hold. In fact the PS500 used the CVP705 sound library, while the DGX670 uses a slightly stripped down CVP701 sound library!). The next closest, the Roland FPE50, has phenomenal speakers, bass and drums, but pales compared to the DGX with strummed guitars, especially acoustic. Also falls short on brass and woodwinds, and since the piano is a Supernatural algorithm rather than samples (like their awesome RD88), it sounds a bit hollow compared to the DGX, and especially the PS500. Unfortunate, because without the PS500, there's no portable arranger piano without compromises. (The discontinued Korg Havian 30 was also really good, and what I would consider compromise-free).
Mark