I've had a Sa11S1 for a couple years now and really am very fond of it, a great player for the money. After experimenting with tweaking it, I've recently found that the Boston Audio Tuneblocks give a really remarkable upgrade to the performance. Krisjan's experience mirrors my impressions. As "mid-hall" or "upfront," I don't know. It seems a fairly neutral conduit that just lets through what ever the recording engineer's mike pattern was. As to negatives, sometimes it has a hard time getting direct access to a track deep in a disc with many tracks. Say if you want to access track 26 on an opera disc with 40 tracks, that sort of thing. I also like the fact that lacks the audio-autopsy hyped up detail that some players have.