Marius,
(Please pardon the way off topic nature of this post.)
I'm curious about your experience with the NA-7004. I bought one, but I sent it back – did not transition from file to file seamlessly. I called tech support and was informed that my unit was operating as designed, which I thought was odd and very disappointing. The user interface on the Marantz left a lot to be desired as well, but I could live with that as long as the thing worked satisfactorily. Due to the fact that it inserted gaps between tracks, I found it very unsatisfactory. The radio features worked fine, but I still think the SONOS is the king in that department (as it also is in ergonomic terms – very slick). At any rate (although, it hardly matters any more), does the unit you have (or had) also fail to provide gapless playback?