Wow. I really love this whistle. Everything seems so much easier to do on it. I have a Dixon, a Sweetone and this Elfsong, and it has quickly become my favorite.
Yesterday, I was working out an air, using all three whistles in turn, and my 14-yr old son (who is more prone to react to the sounds of a detuned, distorted electric guitar these days [nothing wrong with that, either!..]), walked down from his room and asked which was the sweet-sounding one.
I don’t know that Sandy would use it as an ad, but that was an endorsement if I ever heard one!!! 
I have also had a new Elfsong D/C set for just over a week. I won’t try to restate what others have said before, but it truly sings. It is really rewarding to play, and Sandy was very helpful in working through some decisions with me. My sons and I participate in Civil War living history together, including period music in camp, so it was important to me to find a quality instrument that would look appropriate to the 19th century and be rugged enough to withstand life “in the field.” Sandy offered a number of suggestions, and I ended up with a beautiful plain copper whistle (she even kindly agreed not to put her trademark label on it). But what a voice it has! I (almost) understand why Redwolf gave hers a name.
Yep…Elfsong is a great and a marvellous singer. Great for playing particularly an air
Yes…that’s what I particularly love mine for (though it works just fine for fast tunes as well). It just has such a marvelous sound for slow airs…rich and expressive.
I name just about everything I spend a lot of time with, BTW 
All my favorite whistles have names, of course, as do my car (Sebbie) and my computer (Igor…pronounced “eye-gor” by the way, for all you Young Frankenstein fans out there). Even my house has a name, though that’s not so unusual hereabouts…it’s “The Aerie.”
Glad you’re loving your Elfsong! I know I’d never part with mine!
Redwolf