While i agree that a product feature (playing music with 650) should work regardless if it's a primary usage feature or not personally i've given up on this part. My 650 is for reading and my iPod for music. I'd like to have a single device for all but that hasn't worked in the past and wouldn't in the near future i suppose.
I would keep the 650 as it's one of the best ereaders currently available.
Just my 2 cents.
