Sharp is an understatement
347134
Both myself and my spouse have cut ourselves a few times as these things are sharp. I was able to shave the hair off of my arm.
496566
Good knife.  I will have to say though this is sharp as all hell. After underestimating the knife I cut the hell out of myself. It cut without no effort.  Blood everywhere.  Sharpest knife but I don't  know about strength. Great for the money.
2360959
Funny thing is, I'm an Eagle Scout and learned how to sharpen knives while in Boy Scouts.

But I'm also a busy professional, and sometimes I just want sharp knives. And doing a good job sharpening knives...involves a lot of skill and focus.

Much as the "presto" brand implies, sharpening knives with this device is fast and almost magical. You run the blade through both slits on both sides 3x each, and voila! your knife is dangerously sharp. I can sharpen all four of our Victorinox knives in ~2 minutes total, including setting up and taking down the machine.

I hope you found this helpful!

APPENDIX:

If you're also in the market for fantastic kitchen knives that are unbelievably sharp, very usable and still a great value, you can't go wrong with the 3 knife Victorinox set ($70) - http://www.amazon.com/gp/product/B0016O8PGA/ref=as_li_tl?ie=UTF8&camp=1789&creative=390957&creativeASIN=B0016O8PGA&linkCode=as2&tag=allofthetech-20&linkId=V4QQPTW76SD6MD26
4561949
This is without a doubt the sharpest knife I've ever felt.  It is definitely a dangerous knife if you are not careful.  It has a very comfortable handle, and a serious blade guard to protect you from accidents.

The angle of the handle makes this an excellent work tool, which is what it is designed for.  This will probably cut through vinyl tile easily.  The angle makes it easy to get the leverage  you need.  This is remarkable sturdy and the handle is slightly cushioned to make the toughest cutting jobs easier.

For fun, I gave this the paper cutting test and it sliced through it like a razor blade.  I've never had such a sharp knife and know that this is the one I will get a lot of use out of.  However I'm also going to get some of those cut-proof gloves to wear when I use this.
3783605
*****Be sure to read the update at the end*****

First impressions. This is one scary knife. Scary looking and scary sharp. It requires care in opening and closing because the first 45 degrees of blade travel (or last if you are closing the knife) are quite heavily spring loaded. When you close the knife and it reaches that angle...SNAP! Heaven forbid a finger tip is in the handle's opening because it will be laying on the floor. This is because, like so many Cold Steel knives, the blade is beyond just "scary sharp." I would almost say it is "unreasonably sharp."

I've used many knives for many years, and when you collect knives as I have, you cut yourself sometimes, but this knife is a frickin' guillotine! I have yet to try the wave opening, which can probably be done without much danger, but I will be doing 2-handed closing of this baby. I want full control of the blade during the closing procedure.

In place of the opening studs many folding knives have, the Talwar has a plate. Right now, the action is difficult. The resistance is too high for me to reliably open the blade, and if I don't succeed, there goes the blade snapping back into the handle! Hopefully no finger tips have wandered back into the groove. I'm getting a torx tool to loosen the blade a tad, but I fear what I'm up against is spring tension not tightness.

So much for the safety aspect.

Ergonomically, well, I've already mentioned the dangers of opening and closing. Otherwise, the knife is a dream. The G1 scales are very "grippy" (an expression another user used somewhere). The handle is also a grip. The first finger indent is very deep and won't ever let your hand slide forward onto the blade. But you can also grip it from the second indent, in which case the 4" blade becomes, in effect, a 5" blade due to 1" of additional reach.

About the blade, the tip is needle-sharp and because the shape of the knife has a lot of "belly," it's a good slicer as well. Stab or slash, it has all the piercing and cutting power you could ever need.

It's a flat grind and the blade is fairly thin overall compared to other knives. It's just gorgeous. And I love the satin finish better than the stone washed finish of other Cold Steel knives.

The blade is made of AUS8 steel which some purists will say is not the very best, but jeez this is a very common steel in sub-$100 knives, and in fact this one cost me less than $50! It may not be the best but when I consider the stupid-sharp edge on this knife, I can't complain.

This is one helluva knife, but a dangerous one for the owner as well as any attacker. Use with caution!

UPDATE: I emailed Cold Steel's customer service dept and explained my problem with the stiffness of the knife and, guess what? They sent me an email with a return label for sending them the knife so they could look at it, no cost to me.

Two weeks later a brand new Talwar 4 shows up and it's much easier to open. So, ignore that guy who claims he got such bad customer service from Cold Steel. He didn't sound very polite anyway. Antagonizing customer service people is never the best way to get them to help. Ask them to be your hero and by helping you get the value out of the product that you paid for.
1144732
Not as sharp as other knives out of the box. For an s30v steel blade, I was hoping for a beautifully sharp knife. I have had several others of different steel and 1 other s30v blades that have had  extremely sharp blades such as a couple crkt blades that are extremely sharp. My other s30v was a ZT knife that was almost triple the price but i never had that expectation of quality for this price but am still disappointed with its finish as it is very hard to sharpen this knife. The handle is cheap but appears to lock well and the glass breaker is very sharp.
4721497
I've always regarded this knife as scary sharp and just this weekend I was able to verify its sharpness.

I was passionately cutting vegetables to supe up my ramen and in a brief lapse of judgement i cut my index finger. Made it 80% of the way through starting diagonally from the edge of my cuticle to the top-center (tip) of my finger nail. Went to urgent care and got 5 stitches (2 through the nail bed).

Great knife though - Just don't place things you care about in its way.
690916
This is one wicked blade, very sharp! The drawback is the case, there is an opening at the top where the blade arcs above the case and if one is holding it wrong it can become a real issue very fast. Though the Dr at the er said it was a strait clean cut, one might even say "surgical precision"
194170
Amazing  knife but be very careful handling it as it is extremely sharp.  Avoid prolonged cutting sessions (1+ hrs).  I am sure it was the way I was cutting.  Those butternut squash peels are a tough gig.

Improvements.... lets see:
I hold most of my useful knives on a magnet strip on the wall.  I wish there was a way to put this one next to them.  I also wonder how to sharpen a ceramic knife.
1695260
First off, this knife sharpener does have a few limitations, such as really small or long thin blades.  But for every single knife that you can use on this, nothing is better, not even close.

I have been sharpening knives for about 10 years now.  I own every sharpener type known to man.  Ask my wife, I am an absolute nut about sharpening, can not stand a knife that is not properly maintained.  I have been happy with results using other systems like the Lansky, and am even very good with just a good ol whetstone.  I had no idea how poor my knife edges were until using this thing one time, blew my mind!!!!  Started second guesssing everything else I believed in because of it.

Once you get past the sticker shock (still not completely over it) you will never use another system or whetstone again, I promise.
3333038
I have this set in black. When I received it, I was washing the knife and saw all this blood. I did not realize I had cut myself. The cut took four stitches.

This knife is scary sharp. Be very careful with it. I keep it separate from my other knives and use it with caution.
515239
This is an unbelievable product.  I used it to sharpen two older swiss army knives and my Benchmade mini-griptillian.  All knives came out razor, paper cutting, and hair popping sharp...  I can't whittle hair but that may be more technique than the sharpness of the blade.  I simply followed the written directions, 20 strokes on each stone, I did after consulting Benchmade customer service use the 30 degree slots as Benchmade recommended, not the 40 degree as Spyderco said is the all purpose recommended angle. Benchmade said they sharpen their knives at 15 - 17 degrees per side.  40 degree slots on the swiss army knives... Great product that delivered razor sharp results with ease....

UPDATE...  I had a senior moment and bought a Lanski/Gatco system hoping to even get a sharper edge...  Forget about it!!!  First of all I need to use the 15 degree angle per side and could not do it.  The stone hit the knife holder. Called Cus Service, no satisfaction, yes I was told some knives will not be able to use the 19 - 11 degree angles...  Great that is what I need!!!  No where does it warn you about that in the literature!!! So I used a large knife and sharpened it at 15 degrees following instructions and using the ultra fine stone  I ordered extra.  Tested it.  Then dulled it and used the spyderco at 15 degrees per side and also using the extra fine stone I purchased extra.  Tested it...  Spyderco wins hands down.  A much sharper cleaner blade.  Plus ceramic stones don't require oil/water.  I can not recommend the Spyderco Sharpening system enough...  It is an unbelievable system for sharpening knives...
3880690
Although the armour fit very well, they did an absolutely horrible job at making this, the edges are all super sharp!!! you can NOT swing a sword the way it comes to you or else you will be black and blue on all the sharp points (like I currently am) I spared for like 30 mins and what a regret, holy crap, you will cut yourself and you will hurt yourself if you intend to use this for a fighting larp, it works great for a costume. Unless you have the tools to cut metal, i would not suggest this, not one bit, and I don't even want my money back, took 2 weeks to get to me for a s***y product. Also there were already damage marks when it arrived, im assuming from shipping, they weren't all that noticable but still.
629940
Fantasic....Amazingly sharp....This is the first of several of these for me.
2437790
Stupid sharp. Cut myself within first 5 minutes lol. Amazing sharpness and Quality have ordered 2 more types. Benchmade from now on..
798576
Tungsten carbide is extremely hard, on the Mohs scale of hardness it's somewhat close to diamond.  Theoretically, this means this utility blade should be able to handle very rough use.  It can't.  I've been building things from soda cans and needed something to cut the aluminum.  I've been using craft scissors i used in a high school art class but they lack precision, so i decided to try these blades.

I docked the first star because the tips snap right off the blades.  While Stanley is quite clear that the carbide is a coating, the underlying steel is of sad quality if it breaks from piercing a thin aluminum can.

The second star was taken because the carbide coating is of questionable quality.  Material hardness is like paper, rock, scissors.  Tungsten carbide beats aluminum, it's not even close.  SOME wear during cutting is to be expected, but there are obvious notches on the blade from use on only two cans...a material you can tear apart with your hands!  My cheap scissors don't show any wear.

I took the third star because i was let down so severely by this product.  At ~$5 for 5 blades, i'm down one dollar and i only used the first blade on TWO cans.  I can't imagine what this blade would look like after being used on something tough and sturdy as advertised.
1474632
Great knife in every aspect except the sharp corner near the handle.  This knife is extremely sharp and the first few times I used it, I knicked my finger on the corner of the blade by the handle.  I wish they would round the blade off at least, or better yet have the handle curve out and cover the corner of the blade.