Silkstone D+ Alloy Whistle

Anyone have experience with the Silkstone D+ model? I’m intrigued
by the whistle and its extra note on the low end. Please reply if you have anything to say on it, positive or negative.
Thanks,
Brian

I got this whistle for kari for her Birthday,
extremely fine whistle, although..she dosnt use the extra hole much, It does need to be warmed up some (as with all metal whistles)
before it plays well, She did need to use the Jet Dry on the windway But thats a small thing.

Dan