Tone: Pure with nearly zero chiff. You can induce some start-of-note chiff if you attack the notes a little aggressively. The second octave D is a bit chiffy when played with all fingers down, but not nearly as chiffy when the top hole is vented.
Volume: medium low. Perhaps a touch quieter than a Sweetone or a Generation. The second octave is easily twice as loud as the first. It was a challenge to get the first octave loud enough in the recording without too much clipping in the second octave (which occurs when the volume input goes into the red)
Responsiveness: Nimble. I was able to play as quickly as I cared to with this whistle.
Tuning: Unfortunately, this Dixon has some problems with intonation. The second octave is sharp compared to the first, by about 20 cents. I've spent about 3 weeks adjusting the tuning slide and trying different breathing techniques. Beyond looking at the tuner, I take the whistles I review to session, and this one definitely is off from everyone else when I'm in the second octave. If I bring it in tune in the 2nd octave, the first is flat. Considering this is a quiet-ish whistle, that worked for me, since you couldn't really hear the first octave in the loud session I play in, but I don't like that solution very much.
C-natural: Set to the best compromise I could come up with on the intonation between octaves, OXXOOO was extremely flat, around 45 cents. OXOOOO was pretty good though.
Hole size and placement: The holes are well-shaped and centered on body on this whistle. The F# hole is a little small compared to some whistles, but this didn't present a problem for me. The holes are fairly evenly spaced, whithout too much variance in spacing between them.
Air volume requirements: Average. I don't find myself running out of breath more quickly on this whistle.
Air pressure requirements: Low. Takes less pressure than a sweetone, plays easily and jumps the octave without too much effort. This is a very easy playing whistle, and it's a good "blow and go" instrument that doesn't take much thought about pressure.
Clogging: I never experienced any clogging issues with this whistle, which is a relative rarity.
Wind Resistance: Fairly low. Even a low breeze will cut this whistle out if it hits it at the right angle.