About a month ago I bought the He400i because of how cheap they are. I had bought them a year ago and decided I needed the money despite how good they sounded and how much I liked their sound. Well this time my impressions weren't the same. I've gotten a lot better at audio engineering in the past year, so it could be I'm pickier, but I think I may have gotten a bad pair because of how awfully harsh they were. I decided to return them and get the HD650 instead. WOW, I couldn't be happier. The sound is so smooth, balanced and detailed. Soundstage isn't as good as the HE400i, but I think it's more accurate. The tonal balance of these suits my tastes perfectly. Now to get a better amplifier...