Those Lee loaders, or ones just like them, have been around for years. Imagine how long it will take to load 100 rounds doing it one at a time? Probably a few hours.
I'm going to make an assumption here; you want to save money by reloading, but don't want to invest much to get started, right? I'm sure this loader will work, but it is not complete like they say. There are two weak points in this system; the sizer and the powder measure.
A pistol case should be resized along its length, not just at the neck.
The powder measure is marginal at best. There are three types of powder; flake, extruded and ball. All of them, due to their shape, will give different measures in a cup like that. For a shotgun this might not be a big deal, but half a grain difference in a pistol cartridge could make for too much pressure and you don't want that.
If you're going to reload, you must have a good scale(balance). Without one, it is just an accident waiting to happen.
So, there is a lot of money to be saved by reloading. However, it is worth it in the long run to invest in good equipment up front.