A lot of people hold framelocks where their hand grips the lock. It just engages the detent more, and the harder you grip to overcome, the harder you hold it in place.
I thought that the ZT Framelocks were really tight, but if I held the knife in a way that didn't put pressure on the frame lock, it flips right open.
I would have went with the Sebenza as well. All I carry right now are Spydercos, but in this case I would go with the CRK.
"A Southard would be $400 if made in the US"; They don't sell out at $240, and as the many posts in this thread show, in $400 territory it doesn't make the cut. When they say "A Southard would be $400 if it was made in the US", what they really mean is "Southards wouldn't exist if they didn't have plants in Asia". It's not a $400 knife no matter where you make it if it doesn't stand up against other $400 knives, and if it doesn't make dollars, it doesn't make sense. If CRK had the same pricing scheme as most manufacturers, MSRP on the Large Sebnza 21 would probably wind up at 600$, and they'd sell for $410 at retailers.