hello, I own the PJ streambox S2 ultra and share my knowledge.For a long time, I played Allo Digione and I wanted to upgrade to Digione Signature.There was a chance to try a PJ streamer so I did not hesitate.The difference between Allo and PJ is mainly in detail, dynamics and recording space in favor of PJ.Of course, it depends on your audio system, its resolution and the ability to perform.I play mostly from Tidal, or from the NAS server.This tiny streamer plays flac, HiRes and DSD in top-quality formats.If you own a good USB DAC, Pro Ject is a good choice.
Please excuse my bad English, I use Google translator.I am interested in how much the comparison with the great product (according to the answers here) Volumio Primo.