Just sayin’… I’m really enjoying the round and clear tone I get from my black all-polymer Tony Dixon (tunable) whistles. Anyone else out there loving theirs as well?
I started with the Dixon polymer in low A (which is still a bit of a stretch on my fingers but I’m getting there), then I got the regular little high D (sweeet!), and most recently the Bb. Wow, the Bb is terrific imho! Seems to have a more beautiful bell like tone than my brass and Generation Bb whistles. Just feels very responsive. I’ve been playing it along with a fiddler playing in Bb, tunes from the mid 1800s.
It’s yummy! Wondering if others here play and enjoy them as well..
Which Dixon Bb do you have?
I have the black polymer ‘tunable’ two-piece one, with the ivory ring at the bottom. I got it from Hobgoblin Music site. It’s a new whistle, not vintage. Do you have one too?
I like the rich tone on the Dixon polymer Bb. My Dixon all brass “Trad” Bb has the more typical tin whistle sound in comparison. I know many folks dislike the tone of mellow plastic whistles, but I think it’s beautiful paired with a growl-y fiddle. 
It seems easy to get good clear notes from- this coming from me as a beginner player.
I have a tuneable Low D which I thought I’d get rid of when I bought an MK but I’m glad I hung onto it. Bit weak on the bell note but it’s beautifully mellow and so easy in the top register. A little quiet for sessions but great for practicing on. Would recommend for a first Low D.
I’ve got a polymer head / brass body Dixon Bb that I bought last year and I really like it.
It’s outside the current query, but I also like the Dixon all-polymer piccolos; I probably wouldn’t use it out on gigs compared to my Ralph Sweet picc because the polymer mellow tone isn’t what I want from a gigging picc, but as a ‘house fife’ they’re really good and playable.
I bought a non-tuneable one in “D” from eBay a few years ago, out of curiousity and I really and like it for sessions. A clear tone and good volume, without being overpowering.
I myself enjoy the polymer mellow tone (which reminds me a bit of round wooden tone) particularly for when I’m playing (or better said trying to play..lol) pre-1800s music- like Playford, Renaissance, medieval, early European dance tunes… the sound just feels ‘older’ than the bright modern whistle sound to me… but this could well just be a perception on my part, based on association after having heard lots of early music played on wooden recorders while I was growing up.
It makes me wonder whether the polymer Susato whistles sound as nice as my polymer Dixons… but since I’m happy with the Dixons I’m not about to buy a bunch of Susatos just to find out. 
I’ve got a non-tunable Dixon DX001D polymer one piece I keep in my car for my emergency train whistle. I have a rail crossing near my home and this is the one I play waiting for the trains to pass. Very low air requirement and it’s soft enough it doesn’t blast my ears. I think of it as having a very pure tone, little or no chiff. I also have the same animal with a brass tuning slide; DX005D. I like it for the same reasons and think either of them would be an excellent choice for someone interested in trying something a little different from a Generation, Oak, Walton etc. To my ears, they sound less plastic and have less volume then the Susatos. I think they transition very seamlessly into the second octave. I also think they look great.
I would like to introduce my “Big Whistle SV High D Whistle” here.
Although without “Dixon” in its name, Dixon is making this all-polymer non-tunable whistle.
http://www.bigwhistle.co.uk/whistles?product_id=40627
I like its quite “plain” look lacking even a ring at its bottom.
Its sound is calm and smooth but not weak.
It is easy to reach high notes of the 2 nd octave and even higher.
Bell note is stable.
It has little wings in its window but I do not know how they work. 