Very comfortable wind requirements. Here's another thing I like. When I first got my Copeland high D, one of the things that I noticed immediately is I don't make as many mistakes playing it. Mistakes like the occasional flubbed note due to coming down wrong on the hole. Finally, a note on the bag.
Good whistles ought to always come in a case or bag.
This is a really nice corduroy bag with two pouches. You stick those boys in there and flop over the top and tie it with attached cords. As far as my taste and playing style go, these constitute the best high D and high C whistles I have played. My Copeland high D, compared to the O'Riordan is a close call and probably comes down to a near dead-heat. I prefer the construction of the Copeland.