There are certainly lots of advantages with JRiver but it also comes with some disadvantages. The main two disadvantages I see if you have a setup like me is that you can't easily hook up other sources and integrate them into your audio. Second one would be the recognition of chapters on any disc media. You can break it down using MKv but takes time and effort.
Also, just a point on the mid bass - you have to have it 5-10 dB over reference to get good thumping bass. You can feel it at lower volumes but it doesn't become pronounced until you click that volume dial up. Is that the case with everyone?