Never would have bought one meself - far too expensive - but my Dad got me one for my 21st birthday - best present ever. That one went round the world with me, had daily use for about 20 years, and never wore out in any way or to any degree. Probably the best single piece of engineering I've ever owned. I lost it. And bought a replacement straightaway.
I use some things more than others - use the scissors all the time, the blades are both excellent and razor sharp, the magnifying glass is great, even the saw works really well - but I've used every tool on it at one time or another, with the single exception of the one for scaling a fish/removing a hook from a fish's mouth.
Every now & then I go away on a holiday and think...'am I going to need it? Nah - probably not,' and leave it behind. And I end up regretting it every time. You'd think I'd have learned by now, but unfortunately the knife is a lot, lot smarter than me.
Just on the basis of this knife I've long been convinced that the Swiss are like the uber-Germans when it comes to making things like this. It just reeks quality.