i own two LMF II knives and one Prodigy. both have their advantages and disadvantages.
i think that the LMF's are for strapping on when you go deep into the wilderness as it has far more heft and features than the smaller one. the Prodigy is more for when you are just out for a nice walk in the woods or as a BoB knife that will help you move faster in an emergency, ounces count.
i used to carry the LMF small game hunting with me as the best serious knife i had for emergency, now i can carry the much lighter Prodigy and save the big one for big game and emergency events.
Knives are very similar to golfclubs, you need one for every occasion... Right? So basically, yes, they are worth the purchase. - Eric