I also have a Stephen De Ruby shakusazi low C flute that has amazing sound, very similar to the Chris Ti Cooms flute however it does not play the otaher octaves. It was really fun to spend time playing both of these flutes back to back and trying the same song to see how the nuances could work from these two great makers. The added octave features of the Cooms flute are still a bit of a challenge and will require some ( lots and lots of practice) . It is really fun to have a bit more of a range to noodle around with.
I am currently loving both of these flutes.
Feel free to share some thoughts about flutes that you are experimenting with. I would love to learn more about what other flute players are doing.