@arafiq I use the R26 streamer with Roon and HQplayer, faultless operation and sounds great. I use HQP upscaled PCM768 & DSD512.
I prefer the sound of the R26 internal streamer to my Ifi Zen Mini (+ IFI Power X) > Gothic Audio pure silver Outsider USB cable > Gustard U18 DDC > BJC FE I2S > R26. I actually found using a USB direct connection from my server to the U18 (albeit with the Holo Titanis USB regenerator plugged into the server) to be better than the Zen > U18, and closer to but still some way behind the R26 internal streamer. With an external clock in play the gap widens.
That said I know of a few folk with better streamers (like the Ifi Neo Stream) or servers (such as with $2k JCAT USB & ethernet upgrades) who prefer I2S and/or USB connection to the internal streamer.