I just came back from my first trip using this packing system.  While I'm not totally convinced that they saved space (rolling clothes might actually save more) and that things didn't need to be ironed (i took a lot of cotton and linen shirts) they did make organization MUCH easier. I got the 15", 18" and 20" packing folders.  If you are thinking about purchasing these, I would recommend the two larger ones - they were easier to pack.

I used the quarter cube to put in my carry-on with all of my cords and adaptors (i'm not sure a laptop cord would fit if you had a lot of other cords).  I used the half cube for the things I wanted in my carry on that I didn't want to hunt for.  My Kindle, neck pillow, a bottle of water, etc.  Because the cube has a handle, once the plane took off, I was able to put it behind my legs and have much easier access to my things than I would have had if they were in the carry-on under the seat in front of me or, in the overhead compartment.

These are definitely a good buy.