I have to confess it...
I was once a young, fresh private and I (gulp) purchased a knife based solely on LCF... There, I said it, and I don't even feel chills...
IMHO, if you see someone in the field festooned with Rambo-type knives or any other fancy-dandy HSLD kit, they have yet to hump it any real distance, or haven't yet had a run-in with a kind NCO who will show them the light. Experience is the best teacher of all, and the first sign of maturity in a young soldier is usually the dumping of extra kit in favour of one or two pieces that really work. I can remember one young lad showing up at a range practice with M9 bayonet taped to one shoulder strap, fighting knife on the other, armoured compass housing in one pocket, combat wallet, camo cigarette box, jump knife, etc, etc. He looked like a cover model for SOF, with all this brand new gear everywhere, and got a big laugh from all of us.
That being said, some soldiers are always experimenting with what will help them do the job better, more comfortably, and forums like this really do help to avoid spending hard-earned $$$ on crap.
Remember the old maxim - "Any fool can be uncomfortable (and usually is), but it takes an idiot to be needlessly uncomfortable." (but always remember, too, that if you brought it, you are responsible for making sure it gets to you - and for those of us who travel by black cadillac, that means you put it in the big green backpack, along with everything else you or the section, platoon, company, etc, need.