I just wish those 5.11 knives came with plain edges instead of combo's...

A frame lock, by design, would be one of the most secure locks out there. The lockbar is further stabilized by gripping and applying pressure to the handle while cutting - no other lock has that capability.

Benchmade's Axis Lock and Spyderco's Compression Lock are both very strong, and extremely reliable.

You should be able to trust any lock type as long as you're buying from a quality manufacturer (and using the knife within it's parameters).