This is an excellent punch, and perfect for my Personal size Filofax. Sturdy, easy to adjust, and easily punches 8 sheets of paper at a time.
To adjust the holes, all you do is remove the confetti tray under the punch, and you'll see 2 metal sliders. To adjust to the size of the Personal Filofax, move these 2 sliders as far away from each other as possible. Put the confetti tray back on, and that's it - easy-peasy!
This Rapesco isn't so good for organisers larger than the Personal size because you can't move the holes far enough apart. You'd have to punch each set of 3 holes separately, moving your paper before punching the second set of holes. But I see from the other reviews that some people are happy to do this.
I used to have a genuine Filofax punch, and it was a lousy piece of equipment - it's long and narrow and tipped over when I pushed the punch down, and you couldn't do many sheets at a time. Also, it was more than twice the price of the Rapesco!