Well, I have owned one for about 3 weeks. I'm very happy with it. But, I definitely don't qualify as a DAC aficionado. My only prior experience was with the Audioquest Dragonfly Red.
Truthfully, I didn't expect to hear much of a difference between the Dragonfly and the Pro-Ject...I'm very skeptical of all the hype related to the uber expensive DAC's as well.
But, I was wrong. There was a noticeable difference as soon as I first fired it up. More detail in the music. More transparency and I guess I would say better imaging?
I stream Tidal and listen to their Masters MQA files quite often. I wanted to stick my toe in the water so to speak with a little more expensive DAC with MQA decoding capabilities. Had my eyes on the Brooklyn DAC+ that was mentioned above, but being skeptical of the benefits of pouring more money into a DAC, went with a "cheaper" alternative. I guess my eyes have been opened a bit to the benefits of higher quality DAC's.
I'm now actually wondering if the Brooklyn DAC would make as much difference over the Pro-Ject as the Pro-Ject made over the Dragonfly Red. Geez this hobby will put you in the poor house! Haha.
For reference, I have an Arcam AV850, B&W 804d3's / 805d3's and McIntosh MC601's / MC301's. Don't know if that means a higher quality DAC would even benefit.
Anyway...the Pro-Ject is great. Would highly recommend.