I own two Fallknivens right now...an F1 and an S1. I had a WM1, but I ended up selling it. For me, the handle just wasn't right. The shape did not fit my hand, and the blade was not long enough to be that useful.
I don't know the specific application you would like to use it for, but if you're going to carry a Fallkniven, I think the F1 is one of the best usable, practical fixed blades around. The WM1 is quite small and limited in its potential role.
I own the WM1, F1, Garm, and U2. Fallkniven are some of the best users ... all function and great materials.
The WM1 is a great fixed blade EDC and my favorite neck knife. I have medium sized hands and the handle is about right for a knife of this style. It holds an excellent edge and is heavy-duty for a knife of its size.
The F1 is the best all-around knife made for the money. A perfect size for 99.9% of the tasks you do with a knife.
The thickness of the blades on Fallkniven knives are heavier than their competitors. The WM1 looks to be about 5/32" and the F1 is at about 3/16" but both have a very nice distal taper.
You might also want to know that Fallkniven is up for sale. The owner has health problems and hopes that he can find a buyer. If he can't then the stock will be liquedated. Not that I'm suggesting you buy the company, but the opportunity to buy might disappear in the not so distant future.
I have my WM around my neck RIGHT now. This is the ONLY neck knife, and I have over a DOZEN, that I took with me when recently transferred for work. I have another Falkniven neck knife, and a bunch of CS, BM's, CRKTs, a few customs, a Patrolman, a Bow Hunting Buddy by my man Newt (awesome knife...just in a case now...) and even a new ceramic piece I made with a buddy in NY.
My WM is small, comfortable, sharp and stays that way, sharpens easy enough, and EASILY toted all day. It cuts EVERYTHING, and is a great knife around camp, and around the house. It is small enough to not draw unnecessary attention, and yet packs PLENTY of knife in a little package.
Tactically, it cuts through jeans, chinos, and even leather easy enough, and in reverse grip weilds well. I think there is a reason the Spec Ops guys carry a small sharp blade similar to this thing...base of the neck, between a few vertbre, and GOODNIGHT FOLKS.
Grip is different, while comfy, yet small in profile. Sticky when wet, and yet cleans up easy. I use CLP on this thing, and the handle and blade are almost like new.
Only thing I would add...5 small stipples along spine close the handle. Helps with wittling...