I've just finished testing the S1 Evo in conjunction with the N1, and I must say I was very impressed. My experience is similar to that of reviewers, i.e. a lot of naturalness and musicality, but I think that what best sums up my feeling is the absence of frustration compared to vinyl!
A few weeks ago, I tested a highly reputed (and much more expensive) server, and I think that the S1 Evo combined with the N1 is at least equivalent, if not superior. So I've ordered the duo: when I receive them, I'll write another review, in particular on the association with my Playback Design