I'll weigh in here, although I seem to recall replying to this sort of thread a few times already in the past.
In my opinion (and experience), CRKT makes a variety of decent knives, and a few questionable ones. I am not a fan of the AUS-4 shift, and I think the company would really do itself a favour if it kept some 'classic' designs and upgraded the materials.
I have EDC'd an M16-13Z for several years now, and I am generally very happy with it. I have never hesitated to use it for fear of causing damage, and it has put up with a lot. The edge retention is what I expected from AUS-6, but a few passes on a ceramic stone after a day of work return it to shaving sharp. The design is terrific, and very functional; it is lightweight, easy to disassemble and clean (a real strong point from my perspective), and the flipper is an awesome feature. Fit and finish could be better, but I feel that I got what I paid for.
I have a number of other CRKT knives, and I have had varying experiences with them.
The F4 neck knife, for example, seems to be a waste of steel. It could have been nice, but CRKT sacrificed functionality and quality for the sake of versatility and cheapness. My mistake for purchasing it in the first place, though.
The Hammond ABC is a fantastic dive knife or general purpose utility blade. The blade is a bit thick, but it holds a decent edge, is made from a good steel, and has a comfortable grip. The sheath is another exercise in versatility that falls short of its mark - most of the attachment variations are good, but the belt clip is too thin; the first time I had to remove it from the sheath after some use, the act of pulling was enough to bend the clip out of shape.
The M60 is an interesting mix. I've posted a lengthier review in the past, so I'll be brief. It's a good design, and it has a great sheath (although I would prefer a larger side pouch with a non-velcro retention!). It has thumb serrations that can be painful with even moderate use, although you can fix this with a Dremel. I've had one of these for a few years, and I took it out for an outing recently. I used it for camp chores, some fish prep, and general cutting. When I returned home, I was surprised to see that it had accumulated no less than three sizeable chips on its edge (!). I'm willing to entertain the possiblity that I might have misused it (not sure how - I cut wood and fish with it), but I don't think this is the case. I have decided to keep the sheath system and use it for a kit knife I'm working on, and retire the blade.
Overall, my experience with CRKT has led me to believe that the company offers a wide variety of hits and misses, often in the same knife. More extensive testing and better materials could probably mitigate this, but I don't see that as the trajectory that CRKT is moving in right now. The company offers some interesting designs, and I have had some good experiences with them, but I would definitely recommend doing some serious research on any blade before purchasing to determine the extent to which the 'interesting' knives are also functional.
All the best,
- Mike