I have a 710 control and a K325 Hudson and I like the way it sounds. To me it sounds a little like a grainy sound recording of a whistle, rather than the in-person sound of a whistle.
And I agree that the 710 gives you a little tingle feeling through the slide lever when you activate it. It feels like a mild electric shock, but I think it is just mechanical vibration.
Scott Griggs
Louisville, KY