As has been mentioned in the posts above, the 350 does an incredible job and while I had it, enjoyed it tremendously. It produces solid bass response with music and when playing movies, can add good impact. The only thing it does not do is produce the very low LFEs, the kind that are felt but not heard. When I had it, I would turn it up a bit for movies to feel the heavy bass. With the 500 I feel the LFEs and hear the low bass. It adds another dimension for movies. If you can live without the LFEs, I'd stick with the 350.
