Okay, had to post on this knife ....
ahhh, the Gerber Applegate/Fairbairn Covert folder. A long name for, well, one heck of a knife.
It was given to me as a recent birthday present by a very close friend (let's call it Army buddies w/o having been in the service together -- and yes, I did give him a coin in return). Thus, this is a very sentimental knife, before we even get to its redeeming qualities.
I have not tried a spine-whack test on it (which it's big brother, the Gerber A/F Combat, was notorious for failing miserably). However, I inherently have faith in its double lock, while even the liner lock seems to hold pretty well. (I have tried stressing just the liner lock, and the liner lock appears to bend, as opposed to the blade slipping off of the lock, which I feel to be a good thing.)
This blade has been my right-front-pocket carry since I got it -- strong-side, first-line position for me. I would definitely recommend this blade. You can find it for just around $90 on the web. (Let me know if you need a link ... I think I still have them around for those prices.)