There was some discussion about whether HQ Player is for everyone here. I don’t think it is and the benefits it brings depend a lot upon the gear you are using.
If you are looking for real bang for buck SQ improvements, I think room treatment is significantly under rated by many people. That is probably because it doesn’t require expensive gear.
In my opinion if you can absorb the first echo and straighten out the room’s bass response you will find soundstage and SQ improvements in excess of those realised by HQP.