Hello There,
Does anyone have any comments on this whistle please, as I’m considering purchasing one?
Also Big Whistle do a similar whistle called the Dixon Big Whistle SV (Soft Voice) can anyone tell me if this differs any from the DX001?
I have a couple of them acquired from a vendor in a trade for some demonstration playing at a festival. They are decent whistles and a good value. They have a pleasant voice, decent response. They are average in volume and air usage, IMO. They use a little more air and are a little louder than a Gen D and the like. They don’t go tinkle, bing or bong when they fall on the floor late at night like some metal whistles will. They won’t dent but they will warp if exposed to high temperatures, like when left in a closed up car in Florida during the summer. They make a decent backpacking whistle provided you keep them away from camp fires. I like them well enough.
I would suggest the tunable version over the non-tunable model though - far more useful. The one piece whistles I have are pretty well in tune with themselves but that does not help much when you play in a group of other instruments.
I have no experience with the Big Whistle SV. I assume Big Whistle have muted the whistle by obstructing the windway some. I am sure someone else here knows for certain.
You can mute any whistle on your own. There is little sense, IMO, buying one that has been neutered before hand. Use the search function at the top of the page. Type in something like “whistle mute” and you’ll get lots of “how to” instructions. It is quite easy.
Also, you might want to look into developing the “whisper method” of playing. Do another search. That has saved many a marriage over the years, IME.
That search function can be used to answer a lot of questions. It’s pretty darned handy.
Have fun.
Feadoggie
I was thinking of keeping mine in my desk at work, as it seems quite robust in construction, not obnoxiously loud and as you say quiet if it should roll onto the floor.
Thank you for such a detailed and helpful response to my questions.
I carried a bunch of Dixon’s to work in my laptop bag prior to retiring. I’d enjoy having a few tunes sitting in the car in the parking lot during the lunch break when I could. I discovered a couple other players doing the same after a while. The non-tunable Dixon was used some of that time. It is not a quiet whistle. So if you are concerned about being heard by others while at work you’ll want to mute it.
I’ve muted the Dixons effectively. I used a small section of a narrow (700Cx20) road bicycle inner tube with a small window cut out of it as a variable mute. Being a bike junkie at the time I had a plethora of old tubes in the workshop and I like re-purposing things. The small section of rubber tubing slipped over the Dixon head just fine and stayed put. It worked on other whistles too. Because it is somewhat elastic it takes the shape of the whistle head. I could revolve it round the voicing window to limit the volume as needed. Worked pretty well that way for practice. It works much like the mute on the whistles now made by Cary Parks. I came up with it ten years before Cary started making whistles though. If you go that way make sure you clean the inner tube well before putting it on the whistle. They taste awful otherwise. 
But really, cello tape works just as well. It’s temporary mute. You’ll need a new piece of tape periodically. Lots of ways to mute a whistle. Do the search.
I also played with the “whisper method” on the Dixons. The window is large enough to get a decent tone and you’ll never bother anyone playing that way. It works on most any whistle. Try it.
Feadoggie
Once again thanks for such a helpful response, I’ve never come across this ‘inner tube’ muting method before (I use a piece of duct tape usually) As I work in the subterranean depths of a hospital Medical Records Dept, whistle volume isn’t a concern. I enquired about the Dixon Big Whistle SV as I was curious how it varied from the standard Dixon.
I ordered one of the above last week and it duly arrived today. First impressions; a VERY nice whistle indeed, well made, lovely tone (the lower octave is particularly nice), intonation good, loud enough to be heard without being brash, perhaps needs a touch more air than my beloved OAK but all in all I’m very impressed.
An Oak to a Dixon? Those are in my experience two very different whistles. I have a Dixon Trad and the Oak, and the Oak likes to sit higher in the scale and have its notes bended and the Dixon seems to like to sit in the lower range and Blowing off a few cents is difficult.
I’ve not heard that term before, and I was wondering if you could expand on what you mean.
Do you mean that, on the Oak, you prefer the 2nd octave to the low octave?
Just a couple of notes higher, not a full register.
Indeed, and I am enjoying both equally 
I must admit that one baffled me too.
I’ve heard non-trad musicians (orchestral and jazz) speak of an instrument’s “wheelhouse” and I think that’s what’s going on: the range of the instrument that’s most solid and/or has the best tone.
I wonder if “wheelhouse” is an Americanism. It’s used in Baseball to describe that location of the pitched ball where a particular batter is most successful at hitting the ball hard.