I only own one flute and that is a Casey Burn’s mopane in D, which I have owned for two years now and bought it blind.There being only two flute players in the area, one in Michigan, and the other was in Ireland at the time I decided to purchase a flute.
I haven’t played any other flute (moneywise another flute is out of the question in the near future) so my thoughts and experiences are limited to what I have experienced.
I have basically taught myself to play the flute, not having a teacher in the area and owe a lot to this forum and other flute websites for the generous help and information provided.
Now for my thoughts. I am getting a good bottom low D almost consistently with a good strong embochure. The second octave is clean and clear and I hit the notes almost all the time.
Holding the flute was a long process for me, I found the Burns mopane flute heavier than Copley, Heally, and Cotter that I have tried to play. A good friend of mine owns all three above. He has let me try them but my inexperience at playing the flute doesn’t allow me to comment just that the first thing I noticed was that they were lighter by half (well almost.)
I am finding it easy to fill and keep filled and it is or can be a loud flute. I have a reasonably large hand with long fingers the stretch was a bit much at first (standard layout) but that is getting easier every day, as neural linguistic memory kicks in.
I also didn’t have to learn tunes at the same time, having played the whistle for the last twelve years so I can concentrate on everything else I have to do to play the flute.
I have come to like this flute a lot! The tone is woody, deep, and husky. But the second octave has a bright clean sound to it which is almost opposite of the lower octave.
I can see me playing this flute for a long time, cause I so come to love it. I have really struggled with very little inperson help and it is finally paying off. This morning before coming to work, I played Britches full of stitches, in A at speed and the flute didn’t wander all over my mouth!

Being a luddite (you can only play one instrument at a time) this will be probably the only flute that I will own for a long time.
Hope this helps.
MarkB