I can't speak for the 350 owners out there, or to a comparison of the two, but I can say that the 500 is simply awesome. I've never felt that I made a mistake or spent too much money on the 500. I rarely make system recommendations but with the 500, I feel that I can say, without guilt or fear of reprisal, that I can only imagine two scenarios where I WOULDN'T recommend a 500:
1) To a person with an extremely large room (then I would recommend two….or three....or four).
2) To a person with a heart condition.
But this is only one satisfied customer’s experience.
Professional Axiom Lurker