Mark,
We received your email, so I thought Id reply directly to this forum.
The original survival knife was before my time, but we still have all of our records. The problem with the tangs breaking was caused by the cutout in the tang on the very first version. This cutout had a number of sharp internal corners that acted as stress raisers causing breakage (this was strange a very basic engineering error). This was modified by machining in fillet radii, which seemed to do the trick. I dont have any record of the modified version breaking, but I would be interested to hear if anyone knows differently.
When we looked at the redesign, we made sure that we didnt repeat the mistake. We also beefed up the threaded part from M6 to M8. We dont quite get a full thread (the blade is only 6mm thick), but this hasnt caused a problem.
The steel is 440C, as per the original (which was referred to as keenedge). We have experience with this steel, and think its pretty good. We are currently testing some of the more exotic steels such as S30V, ATS34, BG42, etc. If they work out, we may use some of these steels in future projects.
We dropped the gristle saw and bottle opener as they actually interfered with the functionality (eg, the gristle saw snags when dressing game).
We are conscious of the price, but this is driven by the features of the knife. For example, the saw teeth are a pain to grind but are much more effective. Similarly, the contours of the guard make it difficult to machine and rivet, but I think its worth it for the final result. Also, we havent had a major new knife release in ages, so this one was meant as a sort of flagship product in some ways a demonstration of our capability. We do intend to bring out a fixed blade version that will be cheaper.
Hope this was helpful.