I had to knit about 2" on my sock still on the 40" cable since it needed about that much to be able to stretch enough on the 9" cable in order to knit in the round with it, rather then magic loop which I do with my 40" cable. When I figured I had enough knit, I switched over to the 9". Switching over was easy, just like any other needle switching you do in projects. I added a stitch marker to mark the beginning of my round and then I started just knitting on the 9" cable.
Here is where the trouble starts. Don't get me wrong they are not hard to use, and I am sure if I spent a little more time with them they would become easier to use. But one of the reasons why I wanted to knit with the 9" cable was so I didn't have to do the "needle shuffle" so often, as you do when doing magic loop, every 28 stitches or so you are moving needles around to knit the next side. But I found that even though it was for shorter lengths, it was more frequent then magic loop.
My hand also started to cramp up, at which point you know knitting starts to not be so fun. This too of course with a little time could go away as your hands get used to knitting with such small needles with the metal of the needle on each end of the cable being only 2" each. My hands aren't large by any means, but I do think they are larger then my friends hands who recommended the 9" length to me.
I was thinking about my knitting as I knit a few rows, I began to think, now with what is on the needle, and how much room there isn't in 9" of space, I thought well how am I supposed to try these on as I get closer to the heel? There is no way to stretch the cable, and my foot at the ball is 9" so there is a great possibility that while I am trying to maneuver my foot in to try it on, I would lose stitches. It seems like a waste to me to knit maybe 6-7" with this 9" cable and then have to switch back to magic loop knitting just to be able to try on my sock.
So perhaps these needles still are worth getting for some people, if you don't mind knitting on dpn's or magic loop to start your sock, and then switching, and if you either don't mind switching needles to try on your sock, or don't need to try it on, then you may like being able to knit your sock truly in the round on this super short cable.
For now I think I will stick to magic loop sock knitting. And leave these needles in their re-sealable package for future use, or see if my friend wants another pair to enjoy. I think overall I would give the 9" length of needle a 7/10. It wasn't bad, but it wasn't for me.
Hope you enjoyed this very candid review, I love Chiaogoo needles, so much that they are now available in my Etsy Shop. I have 40" lengths to start, but I will be adding more sizes and lengths in the near future!!