I have had a limited amount of experience with these knives as carriers and users. Yes, the "real" ones(3 7/8" to 4 1/4" closed) are big knives...the 4 1/4 inchers being VERY big knives. The master blades of these knives are massive and their "pen" blades can be at least as big as the master blades in some other patterns. At their best, these knives are robustly constructed with strong mainsprings. Interestingly, these knives carry almost as "flat" as much smaller Canoe pattern knives due to their "double-ended"(?) construction. They tend to be plenty heavy, though, especially if they have bone or pearl handles. These "hell for stout" knives are apparently built for hard use, though there seems to be some controversy about what that use may have been. Another name for this pattern is some variation of "rope knife", and I have no doubt that some of these knives were so used. I personally am inclined to accept Bernard Levine's thoughts that their main use was in the hands of old-time electricians and framing carpenters. I would imagine, too, that they were also sold to people who just wanted a "big jack knife" that would stand up to a lot of wear and tear. While I, personally, have not had the occasion to really put one of these knives through their paces, I have no reason to think that their robust appearance and heft are deceiving.