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Apart from @lynx talking bollocks, it has much stronger springs. This means that the tools including the knife blade are not so prone to closing when using them.
They don't actually lock, so are legal to carry without any good reason, but they are a bit safer. Having said that if they do close on you they do close with quite a snap. The side plates that separate each group of tools are brass and the supporting pins that everything pivots on are steel and made specifically. This makes the whole knife much more rigid and likely to stay that way for ever. I have bust swiss army knives in the past as they were pretty worn and then failed when the pins pulled out of the side plate. That and I got exactly the blade and tool combination I wanted. -
As @adroit says Bob makes his own springs (for the scissors and pliers layers only, IIRC). He can also make the side plates and liners in different materials such as ti, brass or copper and in colours and finishes. He also uses hardened stainless steel pins that are much more durable than the standard brass or nickel silver pins. The improved spring action comes from a better fit between the stiffer, larger diameter pins and the tools.
But basically, it's just a pimped swiss army knife. I'd love one but can't justify the price.
Without trying to be rude or disparaging at all and as someone that spends more money than they need to on stuff quite regularly, what exactly is the difference between a $380 Robert Lessard custom Swiss army knife and a much cheaper victorinox?