Hi, I'm a very infrequent poster, but I have an S1 and just bought the S1xb (coated version) and thought I'd share my rambling thoughts on the series in general, not specifically an F1. Sorry for such a long post. It's mostly self-therapy to justify my purchase. Skip if you want, I won't be offended.
Blade thickness
I have thin knives for carving and bushcraft and thick 'survival' knives to play with and do things a knife probably shouldn't do - because I can, it's fun, and life is short. At 6mm, this is a thick one to play with. "Right tool for the job" type of a thing. This is for thick-knife jobs I suppose.
Coating
Fallkniven doesn't really say why it's there, just that it's really hard, and wins against Curly Birch. Tungsten Carbide like drill bit coatings I assume?? I'm assuming it will help protect the knife from scratches and cosmetic damage. Maybe like phone screen coatings. I wanted to try it, I don't think it needs it. I got it.
Handle scales not all the way to handle edge, and in general.
I thought this was weird at first. Whether intended or not, I think it will protect the soft rubber from damage as there were complaints about the original handles wearing down after use by a stray baton strike or just wear and tear. I'm almost certain that someone will make after market micarta scales like TKC does with ESEES. Also, unscrew them and you get a coveting Fallkniven knife blank which are impossible to find now. Knives Ship Free will probably start getting Bark river to rehandle them eventually. But, whether it was intended or not, I like the fact a stray bat won't destroy the scales. If you don't baton knives, maybe this won't be a good feature for you?
Sheath
I personally love the sheaths for trips where it will get wet as they are light, slim-line for easy packing, and replaceable for about $30! But the old one had issues this one fixes IMO. The lock seems to stop the rattle. If the Nylon strap somehow breaks it now has slits so you can tie to your belt with string until you can buy another one for $30. Now the blade locks in, you don't need the strap to secure it (my pet hate with original S1 sheath), so you could probably Macguyver a tek-lok on there (??) or just use the slots to secure it - even rig up for scout carry? Nylon straps dry easily, whereas wet leather sheaths take a long time to dry, and transfer moisture and leather dye/coatings to your pants. So this is a good wet weather sheath. Cleans out easily. So the plastic sheath has a place for certain conditions and I like having a different options to my leather sheaths for reasons just stated.
Lanyard hole
Finally in the right place.
Exposed tang at bottom
Cool, I'll tenderise some tinder by bashing with this part.
CoS steel
Never used it before so can't comment. If it's an upgraded VG10 then that's fine. Eager to play with it.
Looks
I think they look awesome. Yes, a bit more tactical. Maybe one day I'll kill some zombies with it, but probably not. I'll probably just kill an already dead wooden log. And then burn it.
No Choil
I like choils to move the balance point further up on larger blades when needed. S1 and F1 is pretty light and not that large so isn't a problem for me. I think that sharp squared off finger guard used as part of the locking mechanism would be uncomfortable if it had a choil. It would damage my middle finger and inhibit my ability to express road rage. So all things considered, maybe no choil is a good choice.
So those are the reasons I bought one.
Happy travels.
EDIT: forgot about cost...
Cost
Yeah it’s pretty expensive, and I think the price is what causes such critical judgement of them, and rules them out for a lot of people. Overpriced? Well, I don’t know of any other brand making laminated CoS blades that are cheaper, so I’m not sure anyone can actually say they are overpriced, only that they are expensive. You can definitely get great quality stainless knives for less money in elmax, s35vn and CPM154. Maybe for some people those steels are a better choice? Once I’ve tested the laminated CoS I’ll know if it’s a better choice for me or not.