Team Benchmade here.
Bought my first one (model 10300, far left in above photos) about 16 years ago and it's been my EDC ever since. Liked it so much I bought a 2nd one, but with straight blade (no serrations).
Pros: All metal, removable pocket clip, extremely solid blade lock, easy one-hand open & close, heavy (I don't like lightweight knives).
Cons: Uh, they're discontinued so they're hard to find?
Next was a model 530, the one with the black handle. I reserve its use for food only - it's the knife I bring to work when I'll need to cut my food, and I use it to cook when I camp.
Pros: Very solid blade lock, one-hand open and close (not as easy as the 10300), sharp, thin blade makes it easy to use as a cooking knife (think of a folding paring knife).
Cons: The handle (I think it's G10 fiberglass resin) is very lightweight. Again, I'm not a big fan of lightweight knives. Blade lock is a little clumsy with one hand as you need to slide it back with finger and thumb (from both sides of the body).
For Christmas my brother-in-law gave me a Buck 750 (yellow and gray in the pic). I haven't used it yet, and hate to say it but just from holding it and "playing" around with it; I'm not a fan.
Pros: Bright color means I won't lose it? Blade seems strong. Firm blade lock.
Cons: Clumsy blade lock, lots of plastic and rubber. The rubber grip would be nice in wet conditions, but it also makes it difficult to remove from my pocket because it grips the fabric. I also expect the rubber to peel off/get gummy as the knife ages.