I can only offer rank beginner reviews. From that vantage point, the Metcalf Standard D is great! Durable gold finish, thick aluminum. Nice bands revealing silver (aluminum) on the ends. Holographic Celtic knot pattern.
I like the heftier feel of the thicker body. It has great intonation. It plays easily to high-A; B-D is a little tricky; I’d suspect a better player won’t have any trouble.
It’s very responsive to changes in mouth shape. It looks like this a mid-priced, step-up whistle. It’s delivered in a cool padded aluminum tube.
It has a nice airy tone; not instead of bright, but at the same time. The tone varies with the oral cavity of the player.
The mouthpiece is a notch up from the usual. Snug but Tuneable. Curved windway.
I have Clarke Megs, Sonderys, a Susato low A and a Jerry Freeman Tweaked Generation alto in low G. They all sound good. A mouthpiece tweak made the cheap ones sound better, and it helps to make them tuneable.
Conclusion: the Metcalf is a great whistle, slow delivery, but I like the D enough to order the C. It feels less like a toy and more like an instrument.
The Susato is tuneable plastic – thick, durable and professional(?). It sounds great and plays easy. There’s no “air” in the sound; just a good, solid note.
The Freeman is wonderful, worth the price of the professional tweak. It has a sweet, airy sound. High notes are easy.
Megs are great with a little tweaking. I could learn as well on those, and I sometimes forget: A better whistle doesn’t make a better player. Practice does that.
Metcalf, Freeman, Susato – those are quickly becoming my go-to whistles.