I have the Last Chance (5.5"), Peace Maker (4"), and the Shadow Scout (6"). They are all extraordinary knives. The edges take tremendous abuse (yes I used the "A" word) without a wimper and keep their edge extremely well. I use the PM and SS as a stacked hunting set; knives you don't have to worry about making contact with bone during field dressing! The LC I use for my generic hiking/camping/field use knife. You really don't need anything else afield except a machete or larger bush tool. I carry a KOA Bushmaster with it and have never felt "undergunned".
I chose to buy a Knives of Alaska 9.5" Bushmaster in D2, it's an excellent blade (holds an edge much better than many of the steels I've seen used on machetes I looked at) and bridges the gap between a cheapo machete or something higher quality like the Extreme/Final Judgement at 1/3 -1/4 of the price ($99 for a 9.5" blade in D2!!!!!). If I lived in a third world country like Africa or something then yes, I'd not hesitate to spend the extra money for the bigger Fehrmans.
In my mind, I haven't found a better knife than the Fehrman's for hard use field knives. BTW, I'd buy the LC first. To each his own.
Hope this has helped.
NJ