I think the Bluesound Vault is very good. I have the Node 2 and like it a lot. Keep in mind, the more CDs you have the longer it takes to rip them into the Vault. That can be a time consuming task. I don’t know if anyone has uploaded a HDD of music or a NAS into the Vault or if the Vault can access that external source of music. That would be the easy route.
My surprise came from the fact that I setup my NAS to work with the Node 2 and spent much time loading artwork into file folders from my old ITunes library. After all this work and contacting Bluesound support, who are very helpful I began to listen to MQA streaming music and was floored by how good it sounded! That is a plus for Bluesound, that all the MQA unfolding is done in the unit itself.