I have an S1. Great knife. I love it. Solid, sharp, full tang, kydex sheath.
It is a 5" knife, so many think it is too big and thick for bushcrafting. I never had trouble. Don't plan on carrying it around on your neck though. Too heavy for that.
Throws a mean sparkshower with a fire steel.
I have not used it to carve a spoon or do (very) delicate wood carvings. It's possible it is a bit big for that kind of work, but not impossible!!! It works very well for making traps, fire sticks, batonning firewood...
Many believe that the ideal knife is 3-4" long. That's fine, but I do not have an axe, so the extra weight/length comes in handy for me when battoning firewood. I do the very fine cutting stuff with a swiss army knife.
I must admit I just bought an F1 also. It should arrive in a few days.
I am just too curious about that knife...
I plan to give it to my son when he is old enough...
IMHO you cannot go wrong with either.
If you want to know more, just ask.
Bjorn