This mandolin plays a different tune. Sure, you could use your knife & get the same results, if you're that good with your knife, but for speed slicing of (mostly) precise cuts by hand a mandolin is the way to go.
Dangerous little tools, once you've mastered them, you won't know how you haven't used one all of the time.
I was surprised how well this little unit really works. I haven't cut everything with it, nor have I used every attachment. I got it because the price was good for a mandolin that comes with a good sized container.
The only thing that I don't like about this mandolin is the hand guard. It's great that it's large & of course the shape is perfect (good job), but I like smaller holders. Maybe it's just a preference, I'm sure that I'll get accustomed to the large one in time. Be mindful that the holder/guard has metal tines. If you go too far, the metal tines will damage the blades very quickly if they hit the blade.
If you use this on occasion, it's good to know that it all fits back into the box pretty easily. Like anything, it works better when you take it out. Which can be difficult if you're only cutting one or two pieces & it's easier to use & clean your knife. But to whittle down a pile, this thing is great, & that's what they are for (aside from uniform pieces).
It's also a nice little salad/lettuce spinner. This is a fantastic feature, as you only need to bring out one thing to put a salad together for the most part. Obviously, depending on what you slice into your salad. You can rinse off your leaves (spinach, arugula, etc), & slice up your radishes, celery & tomatoes.
You can see the video on this page if you need to or don't know how to use one. It also gives you some good size references to this small unit.