I started my streaming experience with the original ND5XS, which I found easy to use, and as good sounding as the CD player it replaced (Shearne Phase 7). A good, straightforward, plug-and-play introduction to streaming, and I was quite happy with it. I only played my own stored music (ripped CDs and ripped LPs, and downloaded music). For what it is I can recommend it, though of course there are other things out there, and the ND5XS2 has replaced it.
When I later was persuaded by the dealer to upgrade the ND5 with an XP5XS power supply I was very disappointed at the marginal improvement for a lot of money: That led to other discoveries and I ended up replacing first the XP5 then the ND5, and changing my NAS, using a Mac Mini as a store, running Audirvana rendering software, feeding a Hugo DAC, (via a Gustard U12 isolator/converter to block RF noise because Hugo was adversely affected by RF). That gave an improvement in sound quality ( a more natural sound) at less net cost. I upgraded the DAC To my present one a couple of years later after coming into some money, but my store/renderer has remained - however there are a variety of alternatives, some more hands-on to set up than others, of course the self-contained ones like Melco and Innuos being the more expensive of the options.
Re sound quality, if all else is equal, including the same DAC, then streaming from your own stored oil ripped from CD has the potential to sound better because it eliminates read errors that can occur with dirty discs, mechanism going out of alignment, etc – no jumps or stutters, and no interpolation by error correction algorithms.
That said, some people find that when they are streaming from their own store across a network, other influences can have a negative effect on sound quality (e.g. due to RF noise picked up or transmitted via the network, so that in turn network cables and switches in such instances can affect the sound. However that very much depends on their network set up, electrical environment, and most particularly depends on the renderer and DAC concerned and how well isolated they are.
I switched from CD to streaming from my own store nearly 8 years ago now, and have never looked back. Aside from the many convenience factors, I certainly do not miss the occasional misreading of CDs, and the need for replacement of the CD mechanism or the whole player every 10 years or so. However in my set up I do not stream across the network but the music store is in the same machine that renders the files into the digital music stream feeding directly into my DAC.