I have to agree with Peter and Steve (I better - either one of them’s forgotten more about whistle than I’ve ever learned!
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I admit to having WhOA (a fairly mild case - most of my whistles are cheapies) and have had chances to try other folk’s high end whistles. There IS a difference in sound between whistles, but I think the much of the real benefit of the high-enders lies in consistancy and tunability. Though I love the pure sound of a Burke or Elfsong, I must admit that my Oak D ($10) and Dixon nontunable D ($15) have very similar voices. And although I would love to have either of the higher-end whistles, I wouldn’t play any better on them.
I’ve also noticed that whistles I thought were pretty awful when I was starting out now sound much, much better now I have more experience. Not to say there aren’t bad cheap whistles out there (my Walton’s standard D and Generation Bb both needed tweaking to be playable - but the Walton’s is now OK, and the Gen is actually pretty good).
Though they aren’t my personal favorite as best whistle, I’ve had very good luck with Clarke Sweetone Ds (funny colors and all) - every one of the 4 I bought (work, home, whistles for my kids) plays well. And though I had to tweak them a bit, both my Generation D’s are also very good whistles, with a rather different sound than the Sweetones.
I’d also recommend the Walton’s C whistle - mine was a marvelous whistle right out of the box - not bad for under $6! I wouldn’t recommend my favorite cheapie (the Oak) to beginners as their only whistle because of the more precise breath control needed, but it makes a fine second whistle (very quiet and pure voice).
If you really want to go beyond the Sweetone, Generation, or Oak Ds, you might want consider either the Dixon non-tunable ($15, rather pure) or Serpent Brassy Polly ($20, tunable, quite chiffy) - neither one will make you a BETTER player, but they’re both quite good whistles with much better out-of-the-box consistency than the real cheapies and neither will break your budget.
What do I play? Depending on my mood and the tune, I rotate through all the mentioned whistles, but I probably play the Oak and Serpent more than anything else when I’m at home, with the Sweetone and Generation whistles living in my car’s glove box and my desk at work.
Nothing wrong with buying the high-end whistles (and I’ll probably be adding some more to my collection as time goes on) but there’s no NEED to, really - a skilled player on a decent out-of-the-box Generation or Sweetone sounds far better than a less-skilled player on a premium whistle.