It is built like a tank, the CP-300, but even tanks wear out, and at some point need to be decommissioned!
Yes, it is now discontinued, but it took them too long, and the interest/buzz for a new model died out long ago; however, for 350 “pounds” it might not be such a bad deal (assuming it’s in good condition).
A lot is made about the speakers (size), but not much about their placement. For example, the P-515 speakers are smaller, yet the ‘grill’ is slightly slanted towards the back, “a minor detail,” you say, but it makes a huge difference in terms of sound projection, and results in an instrument that sounds ‘larger’ than the sum of its specs.
The P-515 also sweeps the floor with the CP-300 in the action/sound-engine department; however, until recently, the CP-300 was selling for way more money (new), and that makes no sense.
What is the CP-300; a workstation, a synthesizer, a stage piano? Perhaps it attempts to be all these things, and back in the day it probably was….all these things, but today it stands as an enigma that not even Yamaha can explain.