It sounds great!
When I installed v18, I just set it to WASAPI, no conversions, no DSP stuff, no nothing. It operates perfectly, is rock stable and sounds excellent.
Well today, I decided to upgrade to v19.0.32 since they call it the "recommended version" now, figuring it has to be at least just as good and stable as the last 18 version. When installed, it took on all the same settings already existing in 18, so I just let it reload the library and then selected an album to play. Again, excellent sound. Whether it sounds any better or worse than v18 with these settings is hard to tell. I really couldn't tell either way.
After playing a couple different albums today while doing some reading on a couple different forums, I decided to try the option of loading the tracks into memory and playing them from there. Personally, I was expecting chaos since the Compaq laptop I'm using isn't optimized for anything other than the power settings being tweaked. It is running Windows 8 Pro 64-bit, but only has 2gb of ram.
To my surprise, it has been running flawlessly all day without one single glitch or noise artifact coming through. I'm about 7 full albums in now and it just keeps going without any fuss. No bogging down, no stuttering, no hesitations, no freezing up... I thought for sure I would have some kind of weird little issues popping up considering all the stuff I have read regarding playing from memory on other peoples full-on dedicated hi-end computer systems.
Something else I'm surprised to discover, is that it actually does sound better playing from memory. There more flesh, more texture, even blacker blacks, more subtle details present, more acoustic detail of the recording venue. I'm quite impressed! These are all subtle improvements, but when combined, paint a much bigger, brighter, more vibrant musical picture. I have to admit, I never tried playing from memory in v18, so can't compare the two versions there, but I'm totally happy with the sound I'm getting.
I did look at the system resources while playing JRiver this way and there's just a short wifi network spike when the track loads, after that, it goes dead silent as does the harddrive activity. Out of a total of 1.7Gb of ram available, not even 800Mb of it is being used, and the little 2.1GHz AMD Sempron processor is just purring along at 12-14%. And keep in mind, this is with a non-optimized laptop. In fact, some of you may remember, this is the same laptop that I used to use to browse the internet, check my emails, watch YouTube, etc, etc with just a couple weeks ago. It hasn't been cleaned or stripped or anything.