One other possible reason, though, to upgrade is native DSD ability? Can this be utilised through Sooloos though (can DSD be stored on a Media Core?) or is a computer front end required separately, through the USB input?
I had to research this again myself.
From the Oct. 27 2015
data sheet The 818v3 also supports the playback of DSD sources via DSD-over-PCM (DoP) from a suitable media player, using the USB or S/PDIF coax inputs.
The conclusion in
this thread appears to be that the ID41 doesn't play DSD DOP content properly.
Soundserge