Also own a DSJ. From the internet and a friend who owned Node 2:
Dedicated, purpose built servers sound better than using a PC (better power supply, more shielding, less hardware noise, purity of signal, optimized to playback music, etc.). Some state additional reasons (separate input/output ethernet jacks, slower/better data transfer from CD, etc.) for better sound. All according to the manufacturers/press.
Home auditioned an i5 Small Green Computer/Roon/ethernet setup but it sounded no better than my general purpose MacBook Air/iTunes/Tidal/10ft USB cable. Note that it was just the server with 1TB SSD. The company then said it would sound better by adding $1400 (4 boxes, 2 signal conversions, etc.). Rather than jump at the chance to play the bait and switch game, I punted and returned the server. That was 2 months ago, I keep looking and have gotten lots of advice, but not tried another server being satisfied with what I’ve got. BTW I’m a ‘certified’ computer dummy.
Some say “bits are bits” but that seems very old school to me. Some point out that the source should have the smallest amount of effect on sound quality in the playback system which makes sense to me, but then there’s the garbage in/garbage out school of thought. Most of the manufacturer’s reports and reviews now seem like snake oil to me.
BluSound reportedly is a step down from other servers/streamers in terms of sound quality but user/family friendly, so probably not a step up from a PC. Note that NAD now has a more expensive C658, that they call a “Node 2 on steroids”.