Has anyone compared the Opticalrendu streamer to the upgraded Opticalrendu Deluxe?

I am currently using an Urenrendu with an optical feed and have enjoyed it for several years. I have acquired the upgrade itch. It’s my impression that the Opticalrendu might be the next logical upgrade step. Has anybody compared the original to the newer Deluxe version.  I have no doubt that the Deluxe version is better than the original, but by how much? Noticeable or huge or somewhere in between? Opticalrendus have become bargains on the used market, possibly because owners are upgrading to the Deluxe. The new Deluxe version is $1600. I could not find a post comparing them.