I am a fan of the Buck Crosslock. I have not had a problem with them but they do have issues. The liner can easily be inadvertently pressed unlocking the blade. The design allows the blades and scales to flex allowing the lock to happen at different places on the blade.
On the plus side the blade shape is great! You can get a great edge on them. The saw works really well and is good for scraping a ferro rod.
I gave mine to my son. I EDC a Charge Ti with a pocket clip.