Spyderco has been showing concept models of a mega folder at various Amsterdam Meets in the past. I recall one being called the Bison. The result of all this development work is the Tatanka.
The Tatanka was a crowd-pleaser and the large knife was -to me- surprisingly easy to handle and manipulate. I appreciated the fact that Eric and Sal brought along a version of the Tatanka with a clear scale so you could see how the lock works. The tang is radiused so the lock-up will adjust for any wear that might occur. The Tatanka’s lock also made sure the blade had a very nice ‘self close’ to it.