Pros: Handle Feel, Overall Quality, None
Cons: Lock Type
I hope this helps...
I've been carrying a Spyderco Delica for, literally, 15 years. I think I'm on my third one. It's an awesome pocket knife, but a bit small for defensive use. So over the past couple of years, I casually looked for an alternative. I wanted something easy to open, a blade around four inches long with a profile that could be used for a few common tasks as well as defense. The choices these days are overwhelming, but my financial resources are not. I ended up with the CRKT M-21 G10, plain edge. It's a great knife at a very reasonable price. It's big--too big for flimsy dress slacks pockets--and don't expect to fit much else along with it in the pocket of your jeans. It will probably raise some eyebrows if you pull it out at the office to open a box of donuts. But I like the size. It inspires confidence. The handle provides a secure, sticky grip, but it's not going to be very comfortable for prolonged use. The action is very smooth. The friction at the pivot bolt can be adjusted so easily, I can turn the slot with my thumbnail. This might be a drawback because it seems that if it got overly loose, it could lead to a less-than-ideal lock-up--you need to keep an eye on it if you're using the knife for repetative chores. But really, what's the knife for? It's not a utility knife; it's not a camping knife; it's a bit big to be a pocket knife. It's a knife for defense and other tasks that you just don't have the best tool for at the time. It's an easy way to always have a pretty big, sturdy blade on you that in a pinch could be used for any of the above tasks. It's built very well. I can slam this knife into a hunk of wood repeatedly without seeing any play as a result. It takes a great edge. I'm not a big fan of the finicky "auto lawks" feature, it does provide a bit of added security to the liner lock, but it also makes it tricky to close it with one hand. Which leads me to a design concern. Sometimes I can't get the blade to open on the first or second try when it's not set just so in my hand and I don't have room to give the knife a good flick with my wrist. I tend to spend time practicing accessing my gear, and I'm not all thumbs, so when I have a hard time getting a knife to open when I need it, I get concerned. The thumb stud does not provide a backup in this situation: it's almost impossible to open the knife with the stud. The alternative is to use the other hand and open it like you would an old-fashioned "Buck" knife. This makes me miss my Spyderco a bit, but it's not a deal breaker--when it does open correctly, and it almost always does, it's fast, crisp, and locks up solidly. Overall, despite any concerns I might have, it's a better knife at a better price than most of what I see out there. If it suites your needs, get it!