Hi:
Actually, I found PM7001 to be a powerful amp with an iron grip over songs, this I found out after a hurried purchase of CA 640A V2 amp, and am still kicking myself for my blunder. Now, I had this 640 for almost an year, and am able to live with it. But, still I very much like PM7001.
Having said that, the latest PM7003 would be defintely better than 7001, but I haven't heard them. It would be a worthy purchase than the 640 IMO.