Jon, a brief summary of the differences is found at the Audioholics site . Most of them seem relatively minor. Presumable YPAO actually has more than just the tone and time changed. This is a developing technology which may never be perfect, but in addition to Yamaha, Denon and Pioneer some models of HK, Marantz and Onkyo have now added it. The Audioholics review of the 2500 published yesterday may be of interest.

-----------------------------------

Enjoy the music, not the equipment.