Its like a multitool. You can do everything with one tool, but just not as well as all the individual tools in the box. Perfect for lazy non-precision reloaders.
I must say, that video was a bit painful for short attention span people like me, to find out how it actually works you had to sit through the whole video. If he said in the first 5 seconds that its a full resizing die with an expander mandrel that has a shoulder at the top to push the case neck back down, it would have saved a few minutes from my life >:(