When I was at a concert of an Irish band (Geraldine McGowan and band) in 2004 I was so fascinated by the whistle player and the beautiful sound of especially the low whistle that I immediately had the wish to buy a whistle.
Since I have learned to play the recorder when I was a child and kept playing it all my life in recorder ensembles it was not difficult for me to learn how to play the whistle.
What was different compared to the recorder playing was the typical Irish ornamentation like cuts, strikes, rolls, crans and slides and to not tonguing every tone.
I started with a Clare high D and "worked" myself down to an Overton (Colin Goldie) low D.
Please find attached a picture with my whistle collection (from left to right):
high D: Overton (Colin Goldie), Mac Nic, Susato
high C: Mac Nic
high Bb: Tony Dixon
low A: Mac Nic
low G: Ian Lambe
low F: Tony Dixon
low D: Overton (Colin Goldie)
I love all of them and every one has its specific sound and need of breath.
The Mac Nics are very easy to play regarding breath and getting into the next octave - the Overtons need more pressure.
Since I have relatively long fingers I can play the low A, G and F still with my fingertips and need no piper's grip. This is in fact necessary for the low D from Colin Goldie and I had to get used to it for a little while.
I so much enjoy playing the whistles and it is nice to hear that there are a lot of other whistle players here on the forum.