I have several, and I've carried one all over the world. But I hardly ever carry just one of them.
I got my first when I was 19 (vic Tinker), lost it a couple of years later, and didn't get another until I was at AIT and needed a knife (since I had left them all at home before Basic). Got another Tinker, and carried it all over the world for years. Handles are loose now, but the rest of it is perfectly fine and functional. Every blade and tool has marks and scratches from regular use. I could go back to daily carry of it right now and be fine for most things, honestly.
I carry a Vic Soldier or Mechanic and Executive paired up with a one or two bladed jackknife most days. Just seems to work for me. I do most of my cutting with the jackknife, clean fingernails and trim random hairs with the Executive, and use the Soldier for loaning to the knifeless, opening cans, etc. Really, it's overkill. I could, functionally, eliminate the jackknife most of the time and use the cutting blades on the SAKs. And I do, sometimes. I just enjoy the knives, though, so ... why limit myself to one knife, or even one style of knife? When I only had one, that was life. Now, I count myself fortunate to be able to enjoy more of them at a time.