I have been using JRiver since I just got into computer audio. I was not happy with the way music sounded upconverted to resolutions above 192 including DSD. A friend told me about HQ player and how it sounds better than JR for upconverting music. I downloaded the trial version and I am truly impressed. The improvement in sound was instantly noticeable. There is more texture and detail. Bass does not drop off at higher rez like it does with JR. The over all sound is tighter and blacker and it has more depth and resolution.

The down side is that the user interface is not as good and there is no remote app. It also have a steep learning curve if you want to customize the many filters that it has. Although you can use the default settings and get great sound.

It is my go to player now except when I want to stay planted on my sofa. Then I will use JR.

If any one is interested in it, there is a good description of the filters and what they do on an Italian forum here which is easily translated to english-

HQPlayer: Introduzione e Indice argomenti

The guy that wrote this is also on the CA forum.