I love them. The material is light weight, thin but tough. The zipper to compress the cube helps to reduce space for the luggage and you can pack a lot.
Packing cubes are a little flimsier than other cubes, making them slightly harder to pack. The quick open tab makes pulling them open very easy. Compression zipper is a great way to save space.
You don’t realize how genius being able to separate clean and dirty laundry on the same cube is, until you do; nice touch PD. Material seems and feels bomb proof. Amazing how much clothing you can pack into the medium cube.
These things are awesome for organization. With the addition of the new colors it makes it even easier to keep organized. I haven't used the compression a lot, but when I did, it worked well.
I bought a size S and a size M. The quality is high and these are great for packing clothes, the S size holds 5 days worth of underwear with room to spare. If I were to add one request, it would be to have a feature like EVent so I can compress them.