I have an Altair as well and loving it. At first, I was overwhelmed by the options coming from a SD card player (QLS 660), but now really liking the ipad interface using the LightingDS app. I have a 6TB self-powered hard drive connected directly to the Altair, and it has been running flawlessly once my large music directory was scanned (took about an hour).
As a streamer, I have been using the USB out to an Audio-GD (AGD) DI-DSP to an AGD Master 7, and find the QLS to be a better transport. The music is a bit subdued out of the Altair USB out, whereas the QLS to M7 has more of a "toe tapping" musicality. However, please note that the difference may be largely due to my DI-DSP versus the Altair. When I get chance, I want to try out the new X-MOS based SU-1 DDC to see if there are any improvements.
As a DAC, the Altair sounds more transparent, separation of sounds, and 3-D (i.e., depth layering) than the Master 7 on redbook files. However, I find the Master 7 to have a lusher, smoother and more natural midrange and find myself more emotionally moved by the music compared to Altair. This was also the case when I compared the Master 7 with a Yggdrasil, so my impressions are definitely a matter of preference. Pairing the Altair with a tube amp, however, got me the midrange magic (WA WES, WA WA-5), whereas the Altair had a bit of digital grain and dryness on my SS amp (AGD Master 8).
With that said, the DSD and Hi-Res playback on the Altair is effortless. I wasn't too impressed when I experimented with DSD over PCM in the past (i.e., couldn't really tell the difference) but the DSD playback on Altair sounds amazing. Its bringing a new level of realism to the music. I just wish I had DSD tracks of my favorite artists.
@CANiSLAYu, I see that you had owned a Auralic Vega in past. Do you have any impressions of SQ between the Altair and Vega? Also, have you had chance to compare NAS input versus USB hard drive input for your lossless files?