I also have the Sony HAPZ1ES server/player and I am extremely satisfied with it. For the coin, I have not heard better. It’s very easy to use and comes with a great iPad remote app. The only drawback is you have to transfer the files via the ethernet port or via the built in wireless. It would be nice if you could copy directly from another hard drive but that feature isn’t available. The internal drive is only 1TB, but you can add a much larger usb drive via a port on the rear once the main drive is filled up. The player boots up very quickly and has never skipped a beat. It will also play dsd files and can upsample redbook or hi rez to dsd quality. I love mine.
A friend tried the Baetis and thought it was kind of cheesy. He ended up buying an Aurender unit and loves it. It boils down to how much you want to spend. For 2 large ones, the Sony is the way to go. If you want to spend more, go with the Aurender.