Thanks to fabflutes to start this topic.
I’ve bought one of William’s Eb. That’s the one sent to Spain that Billy mentioned some days ago. This post isn’t intended as a complete or technical review since I’m not prof. musician or luthier. It’s just my general feelings about it and some pictures and clips.
http://www.supload.com/listen?s=Syl6B30uRH9
Well I didn’t expect that a bamboo flute were so loud. I’m not really concerned about volume (especially in a Eb meant to be played at home or miked). Said that, I must say that the bell note has great power.
http://www.supload.com/listen?s=StiL4ZH6Tfc
I won’t say which colour, taste or car maker comparison the tone has, I’m certainly in the “it’s the player” camp (not the flute). But this flute is much more responsive and brighter than I thought, exceeds my expectations and will perform much better in more experienced players than me.
http://www.supload.com/listen?s=Sq-58cGoXgV
What striked me more is the excellent tuning. William is a musician, it’s easy to talk to him about preferences and what you look for in a flute. I just told him, “tuning and response”. I got the two of them. The octaves are well balanced both in tuning and volume. I found this flute highly expressive, you can take advantage of variety of volume and smoothness of bamboo to convey an extra to your playing. It’s not a breathy cane flute at all.
http://www.supload.com/listen?s=Srvd5y0M3m1
And some pics:


Aesthetically, the Miller is not terribly appealling. It’s very “natural” finished, far from the Olwells or Rhiannons I saw. William has different finish options and may torched or lacquer it if desired. Nothing wrong in looking bamboo though.
I asked William a slightly 2 mm. off-set (inwards) embouchure hole.


Embouchure hole is not small at all. This flute needs air and focused stream to get a clear tone. Nearly as much as my D Murray I’d say. I’ have to work a bit on that to get used to this new embouchure since I perceive lack of consistency in my tone.

All the holes are burnt. In some of them I perceived some manual work to fine tuning. The whole thing has a lovely scent.
My general impression is that this is a good flute to start with or to explore new tunings for a fair price. Not wood but tt’s got tuning, volume, bright and response. Hope you find these words helpful. If not talk directly to the maker. I found William highly communicative, friendly and professional.
Don’t be too harsh with the playing. No effects at all (well I deleted a cough
), crappy soundcard in a laptop, cheap micro attached, no sound enhacement, and worst of all: my playing! 
Hope you enjoy it