Interesting. I've carried the Victorinox Classic (in fact, I've gone through three or four) but gave it up in favor of the Leatherman Micra. I haven't tried the whistle version.

How loud is the whistle, and how much breath does it take? (In my humble opinion, a very loud whistle that requires a lot of breath isn't worth it- if you REALLY need it, you may be blowing for a long time).