I think Jerry is our resident expert on user-reviews as he's had a good many good products through his hands...

The apparent gentleness of the 400Xi is infinitely preferable to the almost harsh "solid state" nature of the previous model IMO and from experience of the FPB 200 and 300 we had at the same time, this tonal quality was generic to the whole family of Krells of the period.

I really love the EAR599 for its "gentle giant" qualities, a huge pity it's so terribly expensive these days.