There is a problem with this knife
931877
I received this knife and there is a problem. A ZT knife is known for a solid lock up and no blade play when the blade is locked out. That is what "Zero Tolerance" is famous for. This "ZT" has side to side blade wiggle and also has up-down blade play as well, when locked out. Also the spring open assist is weaker than my other ZT knives. I have this exact model in an all black blade version and there is absolutely no blade wiggle in any direction, it is rock solid. Also the spring open assist is not as strong as my original ZT. The spring opening on my original ZT is much more stout and makes a nice solid spring open snap sound compared to this new "ZT" knife. The other thing is that the "jimping" teeth, made to be non-slip where you rest your thumb on the handle is different on this new "ZT" compared to my all black model. The teeth in the 'jimping" on this new model are thicker and not as sharply defined as on my original all black model. Making for the thumb rest to not be as slip resistant as my original ZT knife. I don't know if I received a defective knife or maybe it's a knock off, but I'm returning it.

Update 1/16/2018
I ordered this same knife from another seller and received it. I can now tell you with certainty that the "ZT" knife this seller sent me was not an authentic ZT knife. BUYER BEWARE!
3140427
Cool knife but don't buy unless you know how to fix it when I lt breaks .... 100% gaurentee to break but you can fix it....
4446066
The knife is well balanced and easy to handle.  However, the assisted opening just did not work.  We worked it, we lubricated it and every day since Christmas and just could not get it to work.  We sent it back to Amazon and they are refunding our expenses.  Thank you Amazon.
4331486
Please be warned, as others have stated, this knife will cause more problems than its worth and really should be discontinued.
The simple fact that the blade will only stay in the knife handle if the knife is in the clumsy and not well designed "lock" position, alone is enough to toss this thing.
901613
I love cooking and am very passionate about my knives, so I knew I wanted to buy a Shun because of the rave reviews.

And it deserves those reviews, this knife is incredibly sharp, comfortable, and holds an edge better than my Wusthofs. But, despite these qualities, I am having troubles recommending this knife. My blade has small chips in the blade after only a month or two of light use. Now, I want to be clear, I do not abuse the knife - it doesn't go near a dishwasher, I use a wood cutting block, and it sits in a maple block when I'm not using it.

So far the chips don't really change the knife's performance, I'm sure the chips will continue, and that's unacceptable for a knife of this cost.
58046
The spine on this knife is anything but straight.  at the tip of the blade the spine is distorted and not straight.  I hope this isn't common practice for these knives.  I will be contacting the manufacturer first before I decide on returning or not.
2506405
Got this a month ago and right out of the package and to this day is the sharpest knife ive ever owned but later on i noticed the screws on the pocket clip were stripped and one was very loose causing the clip to rattle. I also started to hear rattling coming from the blade no matter how much i tweak the screw it still rattles. I would've given it five stars had it not had those two things wrong with it other than that best knife ive ever owned
1762207
I've had these knives for a couple of months now, and I am just now realizing that they're defective.  I thought they were wonderful when I fist got them.  But now, when I cut something, they leave paint/pigment on the item.  If I slice cheese with the red knife, the cheese turns red.  This is likely toxic, and means I can't use the knives. I'm not interested in eating toxic paint.
3365159
Knife doesn't lock open like it is supposed to.  Went to try and return it and it's not eligible for return.
658530
There's a pretty big gap between the metal of blade and the handle. Kindof annoying and not good for sanitation purposes. Other than that its a pretty decent knife for the price.
301313
The blade is really sharp, but it loosens after couple of uses and there is no way to tighten it.
1781396
It's difficult to say which is worse: this knife or the company that makes it. Problem with the knife is that the blade won't lock due to engineering / manufacturing flaws. This is a safety issue as the blade can fold down from the "locked" position and seriously cut your fingers. That kind of failure invites product liability and personal injury litigation.

Maybe that's why the Survivor-Tech website has been down for "maintenance" for weeks and the telephone number on the company's Facebook page is NG. Call it and you'll talk to a very unhappy person who's never heard of Survivor-Tech.

If you buy this knife, you may wish you'd never heard of them either.  Their "warranty" and "We're here for you" promises don't mean anything.
4463312
Knife is MOST difficult to extract from sheath--may work loose with time--I have another type sheath to use for now--BUT--the knife has no cutting edge--I can NOT even cut paper--the bevel is ground but no cutting edge---The knife is very nice and well made, good feel and I expect it to be a
great bush-craft knife--------but not until I have a usable sheath and an edge on the knife that cuts---it's not worth my time to send it back for
exchange-I may only get another knife in the same unusable condition--I will sharpen it myself and buy a new sheath--I do think the knife is
worth that effort---I should not have to do these things-- I just got a BAD one -----I bought 2 other knives from the same manufacturer with this one and those other two were just fine  -----Nice  knife  Bad  provided product--no Quality control
4272428
I ordered this knife as a gift for a friend but knew I had to return it as soon as I opened the box and cleaned off the oil. Firstly the steel is poorly hardened resulting in their aestheticly pleasing coating beginning to flake off even in the box. However my larger concern was the crack running the entire width of the blade. It was easy to see if you know your blades but I'm worried if someone didn't notice it they would get hurt since the moment you hit anything harder than cardboard it would probably have thrown the upper third of the blade away potentially injuring someone. The fact that this defect was not seen in Quality control implies a complete lack of care by the manufacturer if not gross negligence. I cannot recommend this knife any less
2342001
The materials and design of this knife are good, like what you'd find in a high quality knife (and blade is very sharp out of the box). I really wanted to love this knife but the quality control issues are real. Blade was off center enough to cause it not to always lock in place when opened. Was also worried that lock would fail because of this. Sending it back for a replacement, hopefully next one will be better. If not, it will probably be the last Buck I buy. So far disappointed but will give it a 2nd shot.
937606
The knife doesn't stay locked into place when the blade is out on mine. Pretty hazardous piece of equipment in that sense.
4582389
I bought this knife as a gift. When I received it its handle was discolored so I sent it back. It may have been an anomaly but I decided to buy a much better knife (Esee Izula II) instead.