I'll throw a wrench into the mix and say CRKT. I've handled two AUS8 Burnleys and one of the CF/Blackwash BHQ exclusive flipper VG-10 models. All of them felt flimsy and had centering issues. I had to fidget with the pivot too much to get good flipping / centering / lockup on all three. Basically, each time, I thought "well, I probably just got a lemon, and I'm sure I'll like this one!" and each time I got one, I thought "Man, what a flimsy POS with poor quality control."
Far be it from me to say CRKT has stellar quality control, but I've certainly had better luck with their folders than Böker. The only Böker knives I've handled that were of good quality were the Uolcos, Squail, and Haddock - the latter of which is a Böker Tree Brand knife, made in Germany, far outside the normal quality range of Böker Plus.
Don't get me wrong - I'm not saying that Böker Plus is a bad line, but there are certain models that seem prone to being less than well made by the standards generally held here. I've heard great things about the Boker Vox F3, for example, but wouldn't touch a Boker Baby Bat with a 10' pole. The quality range is all over the place and the Trapper and Kwaiken are just too flimsy for me to ever recommend.