A:Answer I initially picked up a 400 and took it back - not much better than the TV speakers. To me the 500 was worth the $100 difference. It wasn't night and day, but I was so disappointed with the 400 I guess the 500 is my "entry level" bar. Even the 500 won't blow you away if you are coming from, say, a theater room 7.1 setup like I was (to be fair, that whole system was probably $3000, vs $300 for a soundbar) and I just have to keep telling myself that. I just wrote a review on the 500 if you want more info.