And here's my swatch (you can see how it "zips"):
Hook - J, yarn Caron Simply Soft in Orchid
My take - this makes a very thick fabric. The tutorial is for making a pot-holder, but I think if you were ambitious it would make a very warm blanket. Ooh, it would also make a great thick headband/ear cover.
The drawback is that this stitch will take a lot of yarn. Also, after the sc row, when you start the Siberian sc, you need to be really careful to keep the row from twisting. When you get into row 3, that problem kind of goes away. It can also be difficult to see the free front loop on row 3, so watch out for that. But in future rows it's easy to see the free loops, and it's a very relaxing stitch!