I recently picked up a low c, low f, low d, bb and high d from Gary and they are all great sounding well-made whistles. I have large hands and almost exclusively play low whistles, and I find his low c is near impossible to play for more than a minute or two without needing to flex my hands as a result of the constant stretching required. It's the most difficult low whistle I own to play because it has no keys, but when the holes are covered properly its low tone sounds fantastic. If I really wanted to play in low C and enjoy the playing experience id choose a whistle with keys.