Baranyi - I have not heard the Stibbert. The dealer I bought my Koala from said they liked the Koala as much or better than the Stibbert. Allegedly it has a lot of the same technology. But I think the Stibbert has a better power supply, and of course, the suspension.
The Bluenote Koala is very dynamic, detailed, quick, has amazing deep bass. For a tube CD player, it has the quickness of a solid state player, but with some tube sweeetness on the highs that make them very neutral and non-fatiguing. It's Very nice sounding player. I simply prefered the BAT. My main complaint about the Bluenote is the remote. It is very directional and takes a few button pushes to get it to engage. (yes I tried new batteries) But once the music starts playing ...mmmm. sweet. If you like a front row presentation, the Bluenote Koala will blow your mind. If you prefer a more laid back sound, look elsewhere. FYI - I am likely going to sell my Koala and try something else.