I just got a new-model Reyburn on loan from Ronaldo and have spent a week playing it and comparing it to the two Goldie Low D’s I have to hand currently. (Actually two Goldie heads which I switch on one Low D body.)
A Goldie and a Reyburn

The Reyburn has the always-present Reyburn features of perfect tuning and unique complex somewhat “dirty” tone, a beefy fat presence hard to describe. It’s not mere volume- I’ve had a Reyburn which appeared to have less volume when compared to an MK, yet the Reyburn had more presence.
What’s remarkable about this new Reyburn design is that it has the same superb air-efficiency as the narrow-windway Goldie, which is the most air-efficient whistle I’ve had so far.
Making the Reyburn a delight to play, a wonderful tone and perfect tuning and even voicing across the range, efficient, a solid Bottom D, and high notes which aren’t too stiff. It sounds great playing reels and jigs, and the efficiency allows really long notes in airs.
I should say that my two Goldie heads, from what I’m told, represent the extremes Colin offers in terms of windway height: .8mm which he calls the “hard blower” and 1mm which he calls “very soft/very easy blower”. (Those are Colin’s descriptors; they blow the same to me, but have very different playing characteristics.)
The three heads: 1mm Goldie, .8mm Goldie, Reyburn

The Reyburn plays very much like the .8mm Goldie, with the same air-efficiency, and the same breaking-point with the high notes. I should say that neither the Reyburn nor the .8mm windway Goldie blow “hard” to me. But then in 35 years of playing flutes and whistles I’d never heard of “backpressure” or “hard blowing” or “soft blowing” regarding whistles until I joined this site.
One thing, though, is that the finger-holes of both hands are slightly more widely-spaced on the Reyburn than on the Goldie. For some reason my upper hand is very sensitive to the spacing of the holes, so the Goldie is more ergonomic for me than the Reyburn.
I’ve never been a fan of putting metal in my mouth, and I like the Reyburn delrin mouthpiece much better than the alloy Goldie one.

